This is a very strange issue.Issue 1:Our Microsoft 365 account suddenly started showing an authentication failure. Even after signing out and signing back in, the problem persists. There is no option to bypass the error—the only choices are to keep trying to sign in or remove the account entirely.Issue 2:The same Microsoft 365 account can sign in successfully on a different device, so the account itself appears to be working. It seems as though the authentication problem is somehow tied to this specific device, and we have been unable to resolve or reset it.This issue is causing significant inconvenience because we cannot access or verify our other email accounts. The application remains stuck on the Microsoft 365 sign-in screen and does not allow us to proceed.