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...
We have pretty much the same issue here:
https://social.msdn.microsoft.com/Forums/en-US/43574413-8142-49e7-9fe7-ce37ecd99b44/azure-ad-upns-reset-on-adding-another-domain?forum=WindowsAzureAD
There's a bit more info on there if anyone does have any ideas on resolving it, I'd love to hear it.
Agree this is an issue ;-)
Everything remains stable until you need to bring in and verify a new domain into the tenant.
This has to be a bug, and one that MS don't seem to be able to acknowledge.
