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It's likely due to a Group Policy or security setting preventing you from removing the PIN. Here are some steps you can try to remove it using the registry:
- Press Windows + R on your keyboard to open the Run dialogue.
- Type "regedit" (without quotes) and press Enter. This will open the Registry Editor.
- Navigate to: HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\System.
- Look for a registry entry named "AllowDomainPINLogon."
- If it exists and is set to "1," double-click on it and change the value to "0."