Hey everyone! I'm facing a strange issue with Microsoft 365. After changing a user's surname, I updated their email alias in the local Active Directory from ..sz`@...` to ..sch`@...`. I checked and the `proxyAddresses` attribute in AD is correct now, but the old alias still appears in both Exchange Online and the Microsoft 365 admin center.
Despite running a successful delta sync with Azure AD Connect that adds new aliases, it seems like the old alias just won't go away. When I run a search in local AD using `Get-ADObject` filtered by `proxyAddresses`, I can't find any trace of the old alias either.
I've tried to manually remove the alias in Exchange Online, but it won't let me because it says it's still managed in AD. Has anyone been through something similar? What can I do to remove this stubborn alias that doesn't exist in on-prem AD anymore but still shows up in the cloud? Would really appreciate any thoughts or solutions! 🙂
2 Answers
Have you checked what the user’s User Principal Name (UPN) is in your on-prem AD? Sometimes the UPN can have the old alias hanging around. It's worth double-checking that it's using the new 'sch' domain.
You might try forcing a full synchronization of Azure AD Connect instead of relying on delta syncs. Sometimes the old information gets stuck and a full sync can help clear it up. If that doesn't work, look into using PowerShell commands to remove stale aliases directly in Exchange Online.
Yes, I verified that the UPN is updated to the new 'sch'. So that's not the issue.