Windows Mixed Reality, Unreal 5 and HP Reverb G2 headset?

Hi, I am new here, I am Unity handyman.
I’d like to compare Unity and Unreal VR apps running Windows Mixed reality (with the same assets), but I can’t even get a basic VR scene to run in Unreal Engine 5. The tracking seems to work (on a PC display, but with very low FPS) but the headset is dark.
Question 1.- is it possible to run applications from Unreal in the HP Reverb G2 headset using “Windows Mixed Reality for Steam”?
Question 2.- is this theoretically possible or does it already work for you?
Question 3.- is it possible to find a tutorial for this somewhere- because Epic and Microsoft’s documentation is pretty lacking?
Thank you very much!