Forum Discussion
Can't Open Outlook on Web after changing Primary Username in Admin Center
After changing primary username. I'm unable to use Outlook on Web. It will just keeps on asking account to sign-in, after choosing the new username account and login it will return to the same page a...
Just for general consumption, I have had the same problem with a business account where I set up new User accounts and then completed the DNS and domain set up. All the information was verified and it let me log in and set up MFA. However, Iogging into Outlook presented the same problem as Anos_Voldi described. On contacting Microsoft support they confirmed that this is also caused by a known problem with the O365 platform. A diagnostics process needs to be run which apparently resolves the issue.
IT_for_the_communitywhat "diagnostic process"? Is this something that MS Support must do, or is it self service? Any hints on how to proceed?
