I built it using the VRIF (Virtual Reality Interaction Framework) and Oculus Integration from the Unity Asset store. I used the default VR compatibility settings, so don't know if it would work with Windows MR or Vive. It will work with Oculus Rift or Quest w/Link (requires a discrete graphics card due to using more than one realtime light and not doing ANY polygon optimization :-)
It would be interesting to hear if others were able to play it using the Windows MR or Vive headsets.