I could not find a way to join either the Common or Coalition voice chat rooms while playing DCS in VR. I confirmed I was in a voice chat enabled server, and brought up the voice chat window by pressing Ctrl-Shift-Tab. I could see the window in the upper left with "Push to Talk", plus the Common and Coalition chat rooms, but in VR there does not appear to be a way to interact with that window. I suspect I needed to click on either the Common or Coalition rooms to enter it, but the visible cursor does not interact with that window, only the clickable cockpit.
Is there some other way to enable interaction with that window? Or is there a hotkey to enter one room or the other?
Was playing with a friend who was not running VR, he was able to enter a room. Everything seemed to be set up correctly but that was a show stopper for me.