When I open the game, a window shows up on my desktop as if I was in VR, but my headset only displays that the app is loading. (Windows 10, Rift S)
When you move the headset, it moves in the window?
If so, could you check if maybe you have two graphic cards. If you have, you should try to run the game in performance mode (it should be possible to set it up when you right-click on tea.exe).
If that's not the case, could you send me output.log file (from _logs subfolder) to contact@voidroom.com. please?