You may notice that the UPN of the mailbox is the same as the one in AD if this is your intention then you are done.At this point you should see a single user on 365 that shows up as "Synced with Active Directory" with a UPN Fixing the UPN.Move the user back into a synced OU and run another sync cycle.The unique ID of the two users will now match (you won't see this anywhere in the UI).Manually Match the AD user with the 365 user.The user should disappear from 365 within the next few minutes.Get-MsolUser -UserPrincipalName -ReturnDeletedUsers | Remove-MSOLUser -RemoveFromRecycleBin.Permanently delete the problem user from 365.You will be able to set the UPN of to but the sync will still not work because there already exists an O365 user anchored to Install the MSOL powershell module When you un-sync the user it is moved to the Azure recycle bin so it still exists. When you synced the AD user AD sync did not find a user in Office 365 so it created a new user. You log into Office 365 and see two users now: and try to un-sync and change the UPN of mail1, but the next time you run the sync you get an "attribute must be unique" error or you get a duplicate again. The AD sync service is started and AD users are synced with Office 365 users. In AD there exists an account with a UPN: Office 365 there exists an account with a UPN: two accounts are the same user, but their O365 email address does not match up with their UPN (not usually a problem, but during the initial sync it is) ImmutableID (anchor) = used to link an AD user to an Office 365 user (after UPN matching) UPN = username (and usually email address) On the sync service you get an error saying the attribute(usually the UPN) must be unique. You have synced the AD users, but you have duplicates or two of a similar user and You try to edit the UPN of either user and you receive an error saying that the attribute must be unique.
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