1. Check if proper domain or sub-domain is added to the “Domain” field in configuration. Global domain names should not be used. For example, it should be “net.prolab.com” and not “prolab.com”
2. Nested groups will not work. If you have added an AD group, it should have the users who will be accessing Prolaborate. If the Users of groups inside this group try to log in, they will not be able to log in.