Please refer the article shared below.
New Outlook/Monarch Client

Anyone using the new Outlook run into this? Today I changed my AD password (using a domain joined PC just by pressing Ctrl-Alt-Del). Shortly after as expected all my various other apps and devices prompt for new credentials/multi-factor auth again as their sessions renew.
But the new Outlook on a personal device has failed to gracefully do that and now it just gets error 401 (presumably HTTP 401/Unauthorized). The app doesn't launch at all except for this message.
Troubleshooting and restarting doesn't recover, and the accounts for this don't show up in Windows Settings/Accounts/EMail section.
The option to revert to the prior Outlook is missing. Is my best option to uninstall? I'd really prefer to just re-authorize my credentials if at all possible.
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Fahim Abdul Aziz Solkar 0 Reputation points Microsoft Employee
2023-09-13T01:31:32.9066667+00:00