Recently changes to UPN is not getting sync'd to Office 365. In the Sync Manager, it shows that the UPN change. But in actual it did not change. I have changed other attributes on the same user account and that DOES change properly, however UPN does not change. Looking at the export details it even shows the new value for UPN, but when I check get-msoluser , the UPN has not changed.
Help, not sure where to look for this?