On our Surface Pro 4, it can be enabled by inserting this key in the registry:
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\System] "AllowDomainPINLogon"=dword:00000001
On our Surface Pro 4, it can be enabled by inserting this key in the registry:
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\System] "AllowDomainPINLogon"=dword:00000001