When Windows Hello PIN cannot be logged in, you can follow the following steps to troubleshoot: 1. Make sure that the PIN is entered correctly, check the keyboard layout, case and special characters, and try to reset the PIN; 2. Make sure that the Windows Hello function is enabled and check the TPM chip status; 3. Check the account permissions and group policy, and confirm that the account has the permission to use the PIN; 4. Clear the cache or repair the system files, and run relevant commands to solve the problem.

Windows Hello PIN is a convenient and secure way to log in, but sometimes you will encounter problems that you cannot log in. Although this situation does not happen often, it is indeed a headache once it occurs. If you are troubled by this problem, don’t rush to reinstall the system or change the computer. In fact, there are many ways to troubleshoot and solve it.

1. Confirm whether the input is correct

The most common and easiest reason to be ignored is that the PIN code is entered incorrectly . Many people think they remember it very clearly, but if they are slightly distracted, they may press one more number or one less.

• Check keyboard layout : Sometimes accidentally switching input method or keyboard layout (such as misusing the primary keyboard from a numeric keypad) can also cause inconsistency in the input.
• Try case/special characters : If the PIN you set contains letters or special characters, confirm whether the Caps Lock status and symbol input are accurate.
• Reset PIN : If you fail multiple times in a row, the system may lock your PIN. At this time, you can select Reset in "Settings > Account > Login Options".

2. Check whether Windows Hello is enabled and works properly

Sometimes the problem is not the PIN itself, but the entire Windows Hello function has an exception.

• Go to "Settings > Account > Login Options" to see if the "Windows Hello PIN" status is displayed as "Setted". If not, you can try resetting.
• If you see the prompt "This feature cannot be used", it may be due to a problem with the TPM chip (trusted platform module). You can check if there are any exceptions under Security Devices in Device Manager.
• Run tpm.msc in the command prompt to view the TPM manager status, making sure it is enabled and ready.

3. User account permissions and local policy restrictions

Sometimes, your account permissions or group policy settings will restrict you from using certain login methods.

• Make sure that the account you are currently using is a local administrator account or you may not have permission to change or log in with a PIN.
• If you have a company or school account (Azure AD), some policies may be controlled by the IT department, and you need to contact the administrator to confirm whether the PIN is allowed.
• Check Group Policy: If you have advanced permissions, you can go to "Computer Configuration > Administrative Templates > System > Windows Hello for Business" through gpedit.msc to see if the PIN login is disabled in the relevant settings.

4. Clear cache or repair system files

If the previous methods do not work, it may be that the system file is corrupted or cache errors.

• Try running the command prompt with administrator permissions and enter the following command:

   net user <your username> /active:yes

  Or clear the credential cache:

   rundll32.exe keymgr.dll, KRShowKeyMgr

• Use the system file checking tool:

   sfc /scannow

  If you find any problem, you can try:

   DISM /Online /Cleanup-Image /RestoreHealth

These commands can help you fix some underlying problems and let Windows Hello re-identify your PIN.

Basically, these common reasons and corresponding solutions. In most cases, it can be done through the above steps. If it still doesn't work, it may be a hardware or deeper system problem. It is recommended to try to restore or reinstall the system after backing up the data.

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