Desktop Director Session Connected sows 0 in Dashboard.
To resolve this issue:
Move VDA in different OU and once you make the session ion VDA, you should see the session connected on Director Dashboard. You might have restrictive MS policies were applying on the VDAs.
Allow the path c:\programfiles and c:\programfiles(x86) folders in software restriction policies and after that you should be able to see the sessions on the Director Dashboard.
There were restriction policies applying on VDA.