Try these in order:
- On the sign-in screen, select Network and make sure the PC is connected to the internet. If Wi‑Fi is weak, use Ethernet if available. A Microsoft account sign-in can fail without an internet connection.
- If another account appears in the lower-left corner of the sign-in screen, try that account. If it works, check updates and review the existing accounts.
- Start Safe Mode with Networking:
- On the sign-in screen, hold Shift and select Power > Restart.
- Go to Troubleshoot > Advanced options > Startup Settings > Restart.
- After restart, select 5 or press F5 for Safe Mode with Networking.
- Note: Safe Mode sign-in works only with a password, not PIN or biometrics.
- If the password is correct but still not accepted, recover the Microsoft account password:
- Use Recover your account: https://account.live.com/password/reset
- Enter the email address, phone number, or Skype name used to sign in.
- Choose where to receive the security code, enter the code, and set a new password.
- Double-check the email domain, such as .com vs .co.uk, and try another alias or phone number if the email is not recognized.
- If the screen says “We couldn't find an account with that username” or the account is not recognized, use the Sign-in Helper tool: https://go.microsoft.com/fwlink/?linkid=2214157
- If the issue is tied to the automatic repair loop, try Startup Repair from Windows Recovery:
- Troubleshoot > Advanced options > Startup Repair
- Select the account and enter the password.
- If recovery options keep asking for a password and reject it, and all built-in recovery options fail, the documented next step is to create Windows installation media on another working PC and boot from it, then select Repair this Computer to access recovery options. This requires a USB drive.
- If the account still is not found after recovery attempts, contact support and report that the username has stopped working.
Important: If reinstalling Windows becomes necessary later, that can cause file loss depending on the option used.
- Troubleshoot Problems Signing In to Windows
- Troubleshoot Problems Signing In to Windows
- My username and password have stopped working
- I can't sign in to my Microsoft account
- "You have tried too many times with an incorrect password" error when signing in to your Microsoft account
- How to fix a Automatic repair loop - Microsoft Q&A