unable to login to Outlook MS 365 app bc AzureAD\username login fail

Dwayne Gross 0 Reputation points

I'm unable to log into Microsoft 365 Outlook app. I can log into Outlook web.
When I try to launch the app I'm present with the log in screen with AzureAd\email username request
The screen will not accept my password. However, I can log into all the web apps using that sma eemail and password.

I've repaired, uninstalled and reinstalled Microsoft 365 apps for Business from the web, I've removed all outlook credentials from credential manager. I've run MS support and recovery assistant, I even ran DSRegTool (although I dont undersand what it's doing)

After all those support articles I still can not log into Microsoft 365 Outlook app that I've never had a problem logging into prior to the switch from Outlook to Mictosoft 365 Outlook

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  1. JimmySalian-2011 41,926 Reputation points

    @Dwayne Gross did you tried using UPN instead of Domain\Account - Try this m365account@Contoso.com?

    Hope this helps.



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