Enabling Active Directory Polling

Hello:

I am running into issues enabling Active Directory polling in Solarwinds device tracker.  When I enable a node for AD polling, the validation test comes back as successful.  I have enabled some off our nodes for AD polling, yet no logins display in Device Tracker, although I know there are users logged into these computers.  Can someone please provide some pointers on how to get AD user logins to display in Device Tracker?

Additionally, is there a way to enable AD polling on all of our workstation nodes, without having to edit each individual node to enable it?  We have over 200 workstations and editing each individual node to enable AD polling is going to take awhile.