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Changing UPN AD User Domain
I changed one of our users UPN domain name in AD from domain.local to domain.com. This change then synced the user's AD account into O365 as it should. I then realised that I had picked the wrong UPN...
DirSync sometimes fails to pick up the UPN changes. You can however change it directly in O365 via the Set-MsolUserPrincipalName cmdlet.
Fixed you cannot directly change the domain from one federated domain to the other in O365 - https://answers.microsoft.com/en-us/msoffice/forum/msoffice_o365admin-mso_dirservices/trying-to-change-upn-in-azure-error-unable-to/05759e00-4000-4e7a-bb81-14c6d2152d29?auth=1
That link says you can't do it directly, did you switch it to onmicrosoft.com first then change again?
- It was a typo. I thought I had amended it.