Outlook is prompting me to login with my 365 username preceded by "MicrosoftAccount\". Entering the pw, with or without this, fails. Reset Outlook OST settings back to new, no change. Removed anything related to Office in Credentials Manager, restarted, no difference. Meanwhile on my second computer, using the exact same setup/config, no issues.
So... how can I reset/uninstall Outlook 365 without impacting any other 365 app, all of which seem to be working fine otherwise, ie Onedrive, Excel, etc?
If the only option is remove Office 365 entirely, what's the best way to do that to clobber this sudden credential challenge?