In Microsoft Active Directory, the login ID is stored in the attribute
sAMAccountName. For example, a user with login
firstname.lastname@example.org, displays as bob.kent or testdomain\bob.kent.
In Microsoft Active Directory, the full name of the user is stored in the attribute
displayName. For example, the user with login
email@example.com, displays as Bob Kent.
The field to capture the Display name or Full username is:
As the term 'LDAP' is included in the field name, it can only be used for users authenticating using LDAP; IWA is not supported.