Forum Discussion
Adding additional domain to Office365 changes UPN for default domain
I have had a strange situation occur. I have added a second domain to my Office365 account and as a result it has changed the UPNs for my default AD-synced users from user@domain.com to user@domain.o...
The "finish" process basically means going over the annoying wizard that insist that your DNS records should be configured exactly as shown, which might not be possible (or even a good idea) in all scenarios. But the error you are getting hints to something wrong on the backend as well, so make sure to open a support case to get this properly investigated.
I just clicked finish and it is all good now saying "setup complete', That doesnt explain why my UPNs changed. Perhaps a mystery that'll never be solved....