old msn email address stopped working on every device

if it stopped on every device at once, two things to check. log into Outlook on the web in a browser first. if that fails too it's the account, run the password reset and look for a security block. if the website works fine, it's the apps. Microsoft turned off plain password sign-in for Outlook and Hotmail accounts in mail apps in 2024, so older mail apps set up years ago just stop syncing. remove the account from each app and add it back, picking Outlook or Microsoft as the type so it does the proper sign-in.