login failed

Open a private browser window, sign in again, and reopen the email-preferences page; if the same message appears, run Microsoft’s Sign-in Helper.

Try a clean sign-in session

1. Close the current Microsoft sign-in page.
2. Open a private window:
   • Microsoft Edge: menu … → New InPrivate window
   • Chrome: menu ⋮ → New Incognito window
   • Safari: File → New Private Window
3. Navigate to the Microsoft/Outlook page normally rather than using an old bookmark.
4. Sign in, complete any Authenticator prompt, and reopen the email-preferences page.

A private session does not reuse the existing cookies and temporary sign-in data, which can interfere with authentication.^1^

If this works, clear Microsoft and Outlook cookies in the regular browser before trying there again. In Edge, press Ctrl+Shift+Delete, select Cookies and other site data and Cached images and files, and then select Clear now.^1^

If it still fails

Run the official Microsoft account Sign-in Helper. Enter the affected Hotmail address or phone number and follow the action it identifies. The tool checks personal Microsoft-account sign-in details and provides account-specific recovery steps.^2^

If the helper reports that the password or username has stopped working, use its account-recovery route. Recovery may require receiving a security code and setting a new password.^3^

Do not post the email address, verification code, password, request ID, or other account details in this public forum.

References

1. Can you help me sign into my email account. - Microsoft Q&A
2. Microsoft account sign-in helper | Microsoft Support
3. My username and password have stopped working | Microsoft Support