This behavior indicates the security information or sign-in alias being used in Windows may have been changed or replaced, even if the account still appears normal in a browser session.
Recommended steps:
- Go to the Microsoft account Security basics page and select Review activity.
- Check for unusual sign-in attempts.
- If an activity is not recognized, select This wasn't me or Secure your account.
- On the same Security basics page, select Change password.
- Create a strong new password.
- Check the account’s security info.
- On Security basics, select Update info.
- Verify whether the listed email or phone methods are correct.
- If the shown verification method is not recognized, choose I don't have any of these to replace the security info.
- If Windows is asking to verify with an unfamiliar email address, complete Microsoft’s account recovery path.
- On the sign-in flow, select Forgot my password.
- Then select I think someone else is using my Microsoft account and follow the recovery instructions.
- If a verification code is expected by email, check the junk folder for messages from @accountprotection.microsoft.com.
- Valid Microsoft account verification codes come from that domain.
- If a Microsoft account email is being used to verify another Microsoft account, use two private browsing windows.
- In one private window, stay signed in to the account requesting the code.
- In another private window, sign in to the alternate email account to retrieve the code.
- If a message appears such as "Let's protect your account" or "Help us secure your account", enter an alternate email address or phone number that is accessible, receive the code, and complete verification.
- It does not have to be the usual email or phone number.
Important:
- Microsoft states support agents are not allowed to send password reset links or change account details.
- If the unfamiliar address was added by someone else, the recovery and security review steps are the supported path.
- What happens if there's an unusual sign-in to your account | Microsoft Support
- Can I trust email from the Microsoft account team? | Microsoft Support
- Troubleshoot Microsoft verification code issues | Microsoft Support
- Help us secure your account | Microsoft Support
- What happens if there's an unusual sign-in to your account | Microsoft Support