This is an old revision of the document!
This page contains a listing of the group in the ACM Active Directory domain used for priviledge granting and details on their purpose.
https://www.samba.org/samba/docs/man/manpages/samba-tool.8.html#idp5491952
For the host you can use
ldaps://sambaad1.acm.cs
and for the user specify it as
USERNAME@acm.cs