Duplicate attribute error proxyaddresses. Connect Health states I cannot automatically tshoot the issue and need to manually change the proxy address for the contact. The next troubleshooting step is to use the “Apply Fix” in Microsoft Entra ID Connect Health. Sep 22, 2024 · This will reduce the number of synchronization errors seen by Microsoft Entra Connect (as well as other sync clients) by making Microsoft Entra ID more resilient in the way it handles duplicated ProxyAddresses and UserPrincipalName attributes present in on premises AD environments. It's not necessary to copy all string. It’s not unusual to find issues—like duplicate UPN’s and overlapping proxy addresses—which create errors when using Azure AD Connect to synchronize on-premises identity data with Azure AD. In the local environment, the user is created in AD (no email mailbox) and only the "Email" field is filled in, as some applications read this attribute and send emails to this address. Use Settings to choose between running the Multi-Tenant or Dedicated/ITAR rule sets to Apr 6, 2022 · We have a handful of duplicate attribute errors outstanding - conflicting proxyaddresses. Then, update or remove the conflicting value from the other object (s). com. Unable to update this object because the following attributes associated with this object have values that may already be associated with another object in your local directory services: [ProxyAddresses SMTP: username@domain-name. The match is only evaluated for new objects coming from Connect. com;]. Hoping to get an idea or two to prevent account deletions if at all possible. Oct 30, 2015 · Unable to update this object because the following attributes associated with this object have values that may already be associated with another object in your local directory services: [ProxyAddresses SMTP:*** Email address is removed for privacy *** Mar 14, 2024 · When we started the synchronization of accounts to Microsoft Entra ID, we got error AttributeValueMustBeUnique in Synchronization Service Manager and of course also 'Duplicate Attribute' in Entra ID. I've read many topics about this and applied one of the suggested approach (this one) but it doesn't work for me. Aug 11, 2023 · You removed mail & proxyAddresses attributes from the AD account then did a sync which generated a duplicated account in Azure. To resolve that, we deleted the newly created group and renamed the original group so that it matches what the Aug 26, 2019 · The user account had the message “We detected a duplicate UserPrincipalName conflict on the value user@domain. Provides a resolution. Duplicate proxy addresses If a user with a duplicate email address is synchronized to Office 365, the duplicated proxy address value is simply removed from the object being synchronized and placed in a quarantined state. com -immutableID ******* Feb 13, 2024 · Details from that error is below: Unable to update this object because the ProxyAddresses value SMTP:******@xxxx. Sep 1, 2016 · Note If Microsoft Entra attribute duplicate attribute resiliency is enabled for your tenant, you won't see the InvalidSoftMatch synchronization errors seen during provisioning of new objects. This is between a users account and their contact in Azure. One or more object attributes that require a unique value have a duplicate attribute value (such as the proxyAddresses attribute or the U serPrincipalName attribute) in an existing user account. Hi, After a problem the other day with AD Sync stopped working I have reinstalled it on DC1 and synced again. Several users being sync'd (none are Global Admin) are showing the following error: Unable to update this object because the following attributes associated with this object have values that may already be associated with another object in your local directory services: [ProxyAddresses SMTP: user@domain. From what I could find the two likely causes are disabled AD users being members of the on-prem group and two on-prem AD groups having duplicate attributes. Proxyaddress is the AD property where email addresses are stored for an item in AD. Jan 27, 2025 · The proxyAddresses attribute in Active Directory is a multi-valued attribute that can contain various address entries. I would like to share following details with you: When you install Microsoft Entra Connect and you start synchronizing, the Azure AD Sync service (in Microsoft Entra ID) does a check on every new object and tries to find an existing object to match. The output will give you a list of all the AD objects in your environment that share the same proxyAddress value. Now there's a mismatch in AAD from this? Jul 11, 2023 · I'm getting dn-attributes-failure sync errors for AD security groups in Azure AD Connect. Here are steps and considerations to resolve this: ImmutableId and SourceAnchor: Azure AD uses an attribute called ImmutableId (previously known as SourceAnchor) to establish a link between the on-premises AD object and the Azure AD Discover how to resolve the error: Another object with the same value for property proxyAddresses already exists. Nov 7, 2024 · There you should see an error for duplicate attribute. com, which will cause a collision, since the data in that indexed attribute can’t exist on any other object (the indexed attributes are UserPrincipalName, Mail, ProxyAddresses, and msRTCSIP-PrimaryUserAddress). , if a guest user exists with email address of bob@contoso. There's a tool out there called idfix. Duplicate Proxy Addresses Jul 4, 2022 · A bit unclear. Nov 14, 2022 · I have a fresh, on-premise Server 2019 with AD role enabled. Jun 19, 2017 · – ERROR = AttributeValueMustBeUnique Unable to update this object because the following attributes associated with this object have values that may already be associated with another object in your local directory services: [ProxyAddresses SMTP:John. Please change the proxy address to a unique proxy address and ensure there is no conflict with other users + Run a delta sync Ensure that the object in on-prem AD is correctly matched to the cloud object to avoid further sync errors. If the 2 objects must be different, you have to change the attribute in question in one of these objects (could be user/group/contact). Oct 28, 2024 · Remove ProxyAddresses with a non-verified domain suffix, if the user is assigned an Exchange Online license. Oct 17, 2016 · I created a second test user (testuser1-1@aaronoffice365lab. com). Mar 31, 2020 · I try to update AD user account ProxyAddresses property. May 30, 2025 · Unfortunately you cannot manage the proxyAddresses attribute via Graph, as you've noted above. Jan 4, 2021 · For the proxyAddresses attribute only the value with SMTP:, that is the primary email address, is used for the evaluation. Capitalized SMTP is the primary email address and lower case is alias. Do you want just the names of users that have duplicates in the ProxyAddresses attribute, or the names plus duplicate addresses? Jun 17, 2025 · Use the Entra Connect Health Troubleshooter to update the Source Anchor. Nov 15, 2021 · Could the values of UPN and proxyAddresses of soft-deleted users in Azure AD cause duplicate proxyAddress attribute synchronisation error? E. All attribute values need to be unique across objects. com in Azure AD and we soft-delete this guest account. As you have already found the issue is with duplicate attribute, you can go through this document: Duplicate or invalid May 2, 2023 · my junior tech, added duplicate proxyAddress fields into two seperate distribution list groups, which were synced to azure, and in doing so, attempted changes and any future changes to AD, although the synchronisation service manager, has no issues… Sep 12, 2019 · To find which AD objects have duplicate Proxy Addresses, you can use the scripts in this link . Apr 9, 2025 · Duplicate Attribute Resiliency is a feature in Microsoft Entra ID that eliminates friction caused by UserPrincipalName and SMTP ProxyAddress conflicts when running one of Microsoft’s synchronization tools. When troubleshooting I get the following error, “Unable to update this object because the ProxyAddresses value SMTP:removed@removed. Issue: Duplicate Attribute errors in Azure AD Problem: 6 sync errors are occurring (2= UserPrincipalName) & 4 (ProxyAddresses) Normal Approach:… Table of Contents Entra ID Connect error- Unique Value Unable to update this object because the following attributes associated with this object have values that may already be associated with another object in your local directory services: [UserPrincipalName john@contoso. I’ve installed Azure AD Connect and have successfully synced O365 AAD with the OnPrem AD with the exception of ONE account which refuses to sync. Therefore, the values of the Mail and ProxyAddresses attributes for the object in Active Directory may not be the same as the values of the ProxyAddresses attribute in Microsoft Entra ID. If it's telling you what those two objects are, edit them in either ADSI Edit or ADUC with the view on advanced. May 28, 2025 · When synchronizing Active Directory (AD) with a cloud directory service like Azure AD (via Azure AD Connect), you may encounter the "Duplicate Attribute" error. This feature reduces the number of synchronization errors seen by Microsoft Entra Connect and other sync Hello @Chip Parham Thank you for reaching out. The problem is that the existing objects with conflicting address no longer have those proxyaddresses assigned in our AD. In this video tutorial from Microsoft, you will learn how an administrator can troubleshoot duplicate attribute issues related to Proxy addresses in Microsoft Entra Connect. Feb 29, 2024 · The other side synced group error dn-attributes-failure usually occurs when there are duplicate attribute values exist in the on-premises domain and are part of the group being sync'd to Azure AD. I've… Dec 21, 2022 · Unable to update this object because the following attributes associated with this object have values that may already be associated with another object in your local directory services: [ProxyAddresses SMTP:******@contoso. Out of the blue Connect Sync started to report Duplicate Attribute on 3 The most common type of DirSync errors generated by the organization in Part 1 were objects with duplicate values. Aug 26, 2021 · Hope you are getting this error from Azure AD connect while synchronizing object to AzureAD, if so then troubleshooting strategy and resolution tactics for these errors should not differ from the way duplicate attribute errors were handled in the past. If I then try to synchronize the external user with the Azure AD / Entra ID, I get the message that the "Proxy Addresses" of the guest user and the user in the AD Jan 7, 2021 · Good evening. - Microsoft Entra How to identify and resolve license assignment problems when you're using Microsoft Entra group-based licensing Jan 2, 2024 · Active Directory "proxyAddresses" attribute incorrectly populated Account association between GroupWise & Active directory publishing wrong "proxyAddresses" information/prefix for the email address. This feature does not fix the duplication errors. You then took the On-premises immutable ID from the duplicate account, using Set-MsolUser -UserPrincipalName ******@business. de;UserPrincipalName john. All additional object addresses are known as proxy addresses. The error in the report indicates that there is a duplicate UPN but shows 2 different UPN’s, one under each account. You should be able to see this either in the Sync Service Manager or in the AD connect blade in the portal. In this video tutorial from Microsoft, you will learn how an administrator can troubleshoot duplicate attribute issues related to UPNs in Microsoft Entra Connect. Jun 7, 2025 · I am receiving a duplicate attribute error when AD Sync runs daily. May 30, 2017 · The KB article (KB2647098) only suggests some ways to identify where the duplicate values arise (the email was suggesting the ProxyAddresses attribute). Doe@XXXXX;]. To resolve this conflict, first determine which object should be using the conflicting value. Apr 9, 2025 · This document describes the diagnosis process of duplicated attribute synchronization errors and a potential fix of the orphaned object scenarios directly from the [Microsoft Entra admin center] (https://entra. I noticed that most of the old users have their primary email address located in their proxyAddresses attribute under an SMTP entry (it's located in their mail and mailNickname attributes already). Open Azure Active Directory Find Microsoft Entra ID Connect Click Connect Health Click Sync Errors Click Duplicate Attribute Select the affected user Click Troubleshoot Click Yes Click Apply Fix Diagnose and remediate duplicated attribute sync errors Normally this will fix most errors, but the Aug 12, 2019 · detected a duplicate Proxy address conflict on the value o365 Cloud Computing & SaaS microsoft-office-365 question spiceuser-ifa5e (chris Gavridis) August 12, 2019, 9:48am Apr 11, 2022 · Thank you @rupesh-lepide , @jitensh , and @davidkenney it was an attribute conflict with the user, but it wasn’t with the spouse of the new account, it was a contact in Active Directory that happened to match… funny how that works and I didn’t even think about it. Apr 9, 2025 · Duplicate Attribute Resiliency is a feature in Microsoft Entra ID that eliminates friction caused by UserPrincipalName and SMTP ProxyAddress conflicts when running one of Microsoft’s synchronization tools. May 2, 2023 · Object With Conflicting Attribute details are there but the Existing Object all NA Azure AD sync itself has no errors just a daily critical alert email for Azure AD. Oct 19, 2023 · Error Detail: Unable to update this object because the following attributes associated with this object have values that may already be associated with another object in your local directory services: [ProxyAddresses SMTP:john@contoso. Mar 17, 2023 · Hi @Abhay Chandramouli , the error message you are encountering is due to the fact that two objects in Azure AD have the same value for the property proxyAddresses. Save the script as Get-DuplicateProxies then copy it to your domain controller, open a PowerShell window, and run it. When provisioning users from Okta to Microsoft Office 365. Now I'm getting Duplicate Attribute error that requires a manual fix, although I don't how where to fix it. The "proxyAddresses" field is NOT filled in. Oct 28, 2024 · Cause This issue occurs for one of the following reasons: The domain value that's used by AD DS attributes hasn't been verified. Mar 20, 2024 · The error Dn-Attribute-failure usually occurs when there are duplicate attribute values exist for 2 or more users/groups/contacts in the on-premises domain but those values cannot be assigned to multiple users in Entra ID. Correct or remove the duplicate values in your local directory. The Get-ADUser cmdlet doesn’t give us access to every AD attribute of a User, just the ones visible in the screenshot above. What's the best way about doing this? Mar 25, 2017 · A new feature called Duplicate Attribute Resiliency is being introduced in order to eliminate friction caused by duplicate UserPrincipalName and ProxyAddress conflicts when running one of Microsoft’s synchronization tools. Jun 15, 2022 · It says: Unable to update this object because the null value null associated with this object may already be associated with another object in your local directory services. Azure AD schema doesn't allow two or more objects to have the same value for the proxyAddresses attribute. Oct 15, 2018 · Microsoft last week announced a new Azure Active Directory Connect Health feature for IT pros that resolves duplicate attribute sync errors with an organization's local Active Directory. Azure Active Directory is now Nov 14, 2018 · We detected a duplicate Proxy address conflict on the value smtp: [email protected]. There are three attributes used for this process: userPrincipalName, proxyAddresses, and Jan 22, 2024 · The additional addresses are called proxy addresses. You'll see the Duplicate Attribute Error, for example " ProxyAddresses " followed by the "string" duplicated. Each email address is prefixed with an email address type identifier, such as “SMTP:”, “smtp:”, “X500:”, “SIP:”, etc. At least it's only for 1 shared mailbox. Today Rob de Jong, program manager on the Identity Services Apr 9, 2025 · Note If Microsoft Entra attribute duplicate attribute resiliency is enabled for your tenant, you won't see the InvalidSoftMatch synchronization errors seen during provisioning of new objects. A proxy address lets a user receive email that's sent to a different email address. Jan 19, 2024 · Proxy address conflict when adding an email address in Exchange Online - Exchange Discusses how to resolve a proxy address conflict that occurs when you try to add an email address for a mail recipient in Exchange Online. Oct 27, 2023 · The problem you’re describing is common when first deploying Azure AD Connect (or Azure AD Connect Cloud Sync) to synchronize on-premises AD objects to Azure AD. company . Please refer to Troubleshoot directory synchronization errors with event 6941 - Microsoft 365 Jul 20, 2023 · I’ve been racking my brain trying to figure out what is causing our directory sync errors for a specific SMTP (primary) proxy address. Nov 6, 2018 · As a result, it is recommended that you refer to the following steps to check the duplicate attributes and remove the duplicate one. Mar 20, 2020 · The account would just not sychronise. Jun 16, 2025 · The issue was identified by Microsoft Entra Health, which flagged a duplicate ProxyAddresses error (SMTP:******@domain. Directory synchronization rule sets are different depending on which version of Microsoft 365 is in use. You can read about it here, where from your description you'll be hitting Scenario 2: How the proxyAddresses attribute is populated in Microsoft Entra ID - Active Directory | Microsoft Learn Oct 28, 2024 · Describes an issue in which users are synced to Microsoft Entra ID but one or more SMTP proxy addresses aren't synced. Sep 16, 2024 · Hi I had Entra Connect running for a long time without issues. If you can get it still, it'll tell you exactly where that conflict is. au) caused by conflicting objects in on-premises Active Directory and Microsoft Entra ID. As you have already found the issue is with duplicate attribute, you can go through this document: Duplicate or invalid Jan 23, 2024 · MaxRie Hi, Max. com associated with this object may already be associated with another object in your local directory services. This is expected as an Azure AD-side process named MOERA will calculate what should go into proxyAddresses based on on-premise attributes like mail and userPrincipalName (amongst others). Why? I use a following bit We've been getting sync errors between Azure and our on-prem AD due to a duplicate proxy address. To diagnose the issue, you can follow this document: Diagnose and remediate duplicated attribute sync errors. This originally occurred when our help desk team created an on-prem AD distribution list (global security group) with a duplicate email address. https Sep 25, 2024 · When attempting to provision a user to O365, an error appears stating that another object with the same value for the property proxyAddresses already exists. Sep 11, 2020 · For Azure AD Connect, If there is an attempt to provision a new object with a UPN or ProxyAddress value that is present in AAD already, Azure Active Directory blocks that object from being created and you would get the duplicate error message. last@domain. Using some of the error messages sent in the Directory Synchronization error report email, I will examine why these errors occurred and how we fixed them. However, IdFix reported no problems, and we were unable to find duplicate attribute values based on the instructions. Step 3: Query and fix invalid attributes Log on to the Windows machine where you installed the IdFix tool using an account that has read/write permissions to your on-premises Active Directory objects. microsoft. But I don't understand what the duplicate is there. name@domain. I'm thinking the old agent used another AD attribute to calculate the Source Anchor, but now the new 2. Edit: link. Resolve group license assignment problems. There are three attributes used for this process: userPrincipalName, proxyAddresses, and The user with conflicting attribute in Microsoft Entra ID should be cleaned before you can apply fix. Also identify which two (or more) objects are involved in the conflict. Already tried a full import, delta import, full sync etc. That should take you to a page that lists the cloud and on-prem objects side-by-side, and the on-prem object will show the Distiguished Name, which is the path to the object in AD. Identify the duplicated proxyAddresses, userPrincipalName, or other attribute value that's causing the error. When syncing to Microsoft Entra ID, these values are copied to the shadow attribute and used to calculate the final proxyAddresses in Microsoft Entra2. Identity synchronization and duplicate attribute resiliency Duplicate Attribute Resiliency is a feature in Azure Active Directory in order to eliminate friction caused by UserPrincipalName and ProxyAddress conflicts when running one of Microsoft’s synchronization tools. Dec 6, 2021 · AAD complains about errors in the sync process. com), but manually added the mail attribute testuser1@aaronoffice365lab. Nov 26, 2024 · Hello! I have a problem- Azure Connect detects duplication email proxyaddresses between on-prem Active Directory and Azure. How do I find the duplicate? Apr 14, 2021 · Unable to update this object because the following attributes associated with this object have values that may already be associated with another object in your local directory services: [ProxyAddresses SMTP:john. Jan 14, 2021 · Discusses an issue in which an admin receives a Directory Synchronization Error Report email message in Microsoft 365 that indicates invalid attributes are preventing directory synchronization. Here's the history (to the best of my recollection, some steps may… May 21, 2013 · 2. Check out how to delete the user permanently in Microsoft Entra ID before retrying the fix. Jun 21, 2019 · Unable to update this object because the following attributes associated with this object have values that may already be associated with another object in your local directory services: [ProxyAddresses SMTP: [email protected]]. Duplicate Proxy Addresses (Email Addresses) Finding which AD objects have duplicate Proxy Addresses is quite a bit more difficult than finding duplicate User Principal Names. Copy the String below of it, for examples, " X500:/o=MyCompany/ou=Exchange Administrative ". Jun 25, 2025 · Discusses how to resolve a proxy address conflict that occurs when you try to add an email address for a mail recipient in Exchange Online. Sep 26, 2023 · Hi all, I am setting up Azure AD sync and am getting the following error: Unable to update this object because the following attributes associated with this object have values that may already be associated with another object in your local directory… The problem with the IdFix Duplicate Error is that two or more objects are configured with similar values in an attribute, typically the proxyAddresses attribute. Sep 1, 2016 · This list isn't exhaustive: proxyAddresses userPrincipalName onPremisesSecurityIdentifier objectId immutableId Microsoft Entra attribute duplicate attribute resiliency is also being rolled out as the default behavior of Microsoft Entra ID. In this article Duplicate Attribute Resiliency is a feature in Microsoft Entra ID that eliminates friction caused by UserPrincipalName and SMTP ProxyAddress conflicts when running one of Microsoft’s synchronization tools. Else, you will have to either align the objectGUID AD attribute with the AAD value, or have AAD Connect use a specific attribute like mS-DS-ConsistencyGuid to match users. Looking at AD, either the problematic email is set only on 'Email' attribute, in User properties, in on-prem Active Directory,… Mar 15, 2024 · In this example, you can see that different AD objects (user, contact, and Exchange distribution group) can contain the same proxy addresses; Manually change the value in the proxyaddresses attribute using the Active Directory attribute editor. x uses the objectGUID attribute to do so. g. com associated with this object may already be Jun 17, 2025 · Use the Entra Connect Health Troubleshooter to update the Source Anchor. Unable to update this object because the following attributes associated with this object have values that may already be associated with another object in your local directory services: [ProxyAddresses SMTP:user. This issue occurs if duplicate SMTP proxy addresses exist. If you have at least one license for Exchange Online, you can try some workarounds via the Exchange admin tools, such as provisioning a mailbox for the user and making the necessary changes. de;]. Sep 22, 2023 · Hello @Chip Parham Thank you for reaching out. Oct 11, 2018 · Howdy folks, If you are like many of our customers, the data in your on-premises Active Directory (AD) probably isn’t exactly pristine. Jun 15, 2025 · Hi @ Marc Metzger, Based on your query, I understand that you would like to fix the duplicate attribute issue and encountered different issue while performing it. If this should be the same object Apr 24, 2022 · I inherited a Microsoft 365 environment and when Azure AD Connect is syncing it gives me a synchronization error. The proxyAddresses attribute in Active Directory is used to assign multiple email addresses to a single user, group or contact. This is the same user and I would like them to bed joined / synced. Feb 1, 2021 · Hello, I am experiencing an issue syncing one Windows Server AD user with an existing Azure Active Directory user. The proxyAddresses attribute can contain multiple values, unlike the Identity synchronization and duplicate attribute resiliency Duplicate Attribute Resiliency is a feature in Microsoft Entra ID that eliminates friction caused by UserPrincipalName and SMTP ProxyAddress conflicts when running one of Microsoft’s synchronization tools. Can you please explain the steps? If you need more information, please let me know Error I'm getting: Unable to update this object because the following attributes associated with this object have values that may already be associated with another object in your local directory services: [ProxyAddresses SMTP: first. Otherwise, your only option would be to recreate the user which might be problematic depending on its Feb 9, 2022 · I guess we have some work to do because when using Azure AD Connect, you need to make sure there aren’t any duplicate proxyAddresses attributes configured and that the proxyAddresses that are configured match the email addresses configured in Azure AD. Any email message sent to the user's proxy address is delivered to their primary email address, which is also known as the primary SMTP address or the default reply address. This error was detected on 11/12/18 2:59 PM. Jul 28, 2025 · Duplicate Attribute Resiliency is a feature in Microsoft Entra ID that eliminates friction caused by UserPrincipalName and SMTP ProxyAddress conflicts when running one of Microsoft’s synchronization tools. . These two attributes are required to be unique across all User, Group, or Contact objects in a given Microsoft Entra tenant. Select the error and select the entry for the duplicate. Hello, You have to do the following: Check which attribute is raising the exception - usually it is the proxyAddress. doe @mathieu. We would like to show you a description here but the site won’t allow us. c9wm p4z rpfb 9i lm5pp m8rdf a66ozz o0vgwt 2pfqw uh1it