IT-Shop - authentication with AD UPN

version 8.2

We have setup an IT-Shop with Active Directory user account as primary Authentication module and Active Directory user account (manual input/role based) as secondary.

This makes it possible to login with the Loign name (pre Win2000) (=SAMAccountName), but we want to login with the User login name (UserPrincipalName)

Does anyone know how to change this to UPN?