How to make Active Directory Identity Based rule on firewall

Hi everyone,

I have successfully installed and configured STAS (Single Sign-On) on my Active Directory Server and established the connectivity with firewall. But now I'm unable to make the firewall rule based on Active Directory User In Sophos because in Identity Section there isn't any active directory user group is showing there. I'm running Microsoft Terminal Servers for the user. Might be possible that I'm doing something wrong, anyone here point me out to the right direction and solve my issue. I have search everywhere but I couldn't find any precise information or tutorial regarding my problem.

Thanks in Advance