Hey everyone! I need some help with Azure AD Connect. I've started using it after setting up a fresh Active Directory on-premises for users who've been using Office 365 for a while, but I'm running into issues. I created a test user in the new Active Directory that already exists in Office 365. After the sync, I noticed that it created a duplicate account in Office 365 instead of linking to the existing one. The new account appeared as [[email protected]](mailto:[email protected]), but it didn't modify the existing 365 account. I've checked the userPrincipalName on the AD server, and it matches the sign-in name for 365. The only error I found is 'AttributeValueMustBeUnique Proxy Address' for that test account. I've synced other users without issues, but this one seems to be problematic. What could I be doing wrong?
1 Answer
It sounds like you're experiencing a common issue with duplicated accounts. Have you made sure to add an SMTP/Proxy Address that matches the user you want to link in the cloud? Here’s a helpful guide that might clarify how to do that: https://support.microsoft.com/en-us/topic/how-to-use-smtp-matching-to-match-on-premises-user-accounts-to-office-365-user-accounts-for-directory-synchronization-75673b94-e1b8-8a9e-c413-ee5a2a1a6a78.
Yeah, I checked, and it seems like that user is the only one having this issue. I found that error message 'AttributeValueMustBeUnique Proxy Address' specifically for that account.