Notification for Groups Not Working

I already reported this issue to tech support, but I would like to know if others experience the same behavior. I configured certain group members to receive notification when a request is placed in their group's queue, and I also configured the Notification Rules to enable group notification. But so far nothing happens. None of the group members receive a notification by email that a request has been placed in their group. However, we receive notifications for overdue, approvals, notes and individually assigned requests, so the outgoing email is working fine. Tech support tried to help by giving me the how-to for group notification, but as I mentioned that is configured already.

Thanks.