OUTLOOK E-MAIL

Try these checks in order:

1. Sign in to Outlook on the web in a private or InPrivate browser window. If that works, the account is available and the issue is likely cached sign-in data in the browser.
2. If private browsing works, clear cookies related to Microsoft, Live, and Outlook in the regular browser, then close and reopen the browser and try again.
3. If the sign-in page keeps looping or signing out, sign out of all active Microsoft account sessions, wait a few minutes, and try again.
4. If Outlook says to sign in through a browser, complete the sign-in in the browser first, check for any security prompts, then reopen Outlook and try again.
5. If using the Outlook mobile app, install the latest version. Recurring password prompts can happen when the app’s security standards have been updated.
6. If using iPhone or iPad with the default Mail app and seeing prompts such as “Please enter the password for the Outlook account”, “Account not authenticated”, or “Cannot Get Mail – The connection to the server failed”, re-enter the password in Settings > Mail > Accounts > Outlook, save with Done, then open Mail and confirm sync works.
7. If the problem started after changing the primary alias on an Outlook.com account in Outlook for iOS or Android, delete the account from the app and add it again so the correct settings are imported.
8. If none of the above works, use Microsoft’s sign-in helper for Microsoft personal accounts.

• Can't sign in to the Outlook mobile app | Microsoft Support
• How to Fix Outlook Sign In Issue - Microsoft Q&A
• cannot log into my microsoft e-mail - Microsoft Q&A
• iOS & iPadOS users may experience issues accessing their Outlook and Hotmail accounts from the iOS/iPadOS default Mail app | Microsoft Support
• After I changed my primary alias on my outlook.com account, I can't log back in