MSProject Server-Resources by Group view

I'm trying to determine who all the task managers are in our MSPS installation. We created a group called Project Managers and with few exceptions, people in that group are task managers (per Collaborate >> Publish >> Republish >> [checkbox] Become the manager for these assignments). I can find the names of all resources in the Project Managers group, but I want a view that shows their email addresses as well. I've tried creating a Resource by Group view but the Group column always comes out empty. Any suggestions gratefully accepted.