Policy
Require digits
Use this policy setting to configure the use of digits in the PIN. If you enable this policy setting, Windows requires the user to include at least one digit in their PIN. If you disable this policy setting, Windows does not allow the user to include digits in their PINs. If you do not configure this policy setting, Windows allows, but does not require, digits in the PIN.
c433dbbe8185 MSPassport_Digits Registry
Copy registry mappings
HKLM\SOFTWARE\Policies\Microsoft\PassportForWork\PINComplexity\Digits (enabled) = 1
HKLM\SOFTWARE\Policies\Microsoft\PassportForWork\PINComplexity\Digits (disabled) = 2 Policy notes
Use this policy setting to configure the use of digits in the PIN. If you enable this policy setting, Windows requires the user to include at least one digit in their PIN. If you disable this policy setting, Windows does not allow the user to include digits in their PINs. If you do not configure this policy setting, Windows allows, but does not require, digits in the PIN.