Hello
It's probably due to the credentials located on your local machine. If you have set up a PIN to sign in to Windows 10 and have never logged in to the computer with a password, the PASSWORD is not found on the local machine. Since the PIN only works for the local device and not for the entire network, you will need to log in to the computer 1 time with the full password. Then it should work after that... at least until an update removes it.
Go to Settings
Accounts
Login Options
Under Additional Settings --> TURN OFF "To improve security, only allow Windows Hello sign-in for Microsoft accounts on this device
Click on some settings (e.g., Apps) and then click "Accounts" again
Back to Login Options
You shouldn't see "Password" under "Security Key"
If after clicking on it you see "Everything is already set up"
Press "Windows Key + L" to lock your computer
Log in to the machine with your full Windows 11 password
You should be good to go!
Go to your other computer and test your credentials.
Hope this helps!
PS. You can then turn the "Enhanced Security, only allow Windows Hello" option back on and resume with only a PIN. The PASSWORD will now be stored.
Best regards
Zunhui