This policy setting allows you to control whether a domain user can sign in using a PIN. If you enable this policy setting, ...

This policy setting allows you to control whether a domain user can sign in using a PIN.

If you enable this policy setting, a domain user can set up and sign in with a PIN. 

If you disable or don't configure this policy setting, a domain user can't set up and use a PIN.

Note that the user's domain password will be cached in the system vault when using this feature.