Hello Robert, sorry about your problems. My name is Marco and I will do my best to help you.
To change the login method from password to PIN for Remote Desktop in Windows 11 Pro, you can follow these steps:
-Press Windows + i to open Settings.
-Go to Accounts -> Sign In Options.
-Below the PIN option, there should be a button to stop requiring a Windows Hello login for extra security. If there is, turn that off. This should allow you to switch from a password to a PIN.