When I go into manage admins/members in a user group in the admin console (by taking the following path Admin Console > people > User Group Summary > GROUP > edit Admins > Add Admin > add), I see an option to "Filter users:." However, when I put something simple such as a name or email in this box, it shows no results.
How can I use this filter to check to see if users are already group members?
I think it takes some time for this to show up. Not sure if this is related to indexing, but try it again and see if it is better today.