Renamed AD users UPN not syncing with Office 365 via DirSync
I recently renamed an existing users account and forced DirSync to push the changes to the cloud. Since the user was already Synced I had to add the old users email as a proxyAddress in the attribute editor etc. Everything synced up pretty well, but the problem was that the E-mail field in AD UPN didn’t match the 365 username. The account worked, but had mismatches with the send from field and signing into Outlook.
Microsoft had a handy fix for me, but its still kind of odd it didn’t do it automatically, but at least it was easy fix. It was Scenario 2 in my case, something do do with renaming users with a 365 license it seems. Basically connect to Azure AD using PowerShell then…
Finally run the following Windows PowerShell cmdlet:
Set-MsolUserPrincipalName -UserPrincipalName [CurrentUPN] -NewUserPrincipalName [NewUPN]
Now everything matched up, I did a repair on the Outlook profile and all was good.