Looks like Facebook Messenger om Chrome or Edge will give you a hardware error when trying to access ANY webcam if OBS is running a virtual cam. Even though the permissions are set up correctly to allow FB messenger to access the camera, it still gives the hardware error.
Meanwhile the OBS Camera virtual cam is recognized easily by other online chat platforms like Google Meet, Duo, etc. It works fine on Zoom as well.
FB Messenger video chat doesn't work at all with IE, so I couldn't do it there. I tried Firefox, and it DOES work... but only when doing one-on-one video calls. Firefox doesn't support group video chat on FB Messenger and fails, advising you to install Chrome, which we already know doesn't work.
I tried to use Skype, but it appears that virtual cam is using a protocol not recognized by the Windows 10 iterations fo Skype?
If anyone knows a work-around for the FB Messenger/ Google Chrome situation, or Skype compatibility, please let me know.
Thanks