We’ve tested Floor Plan 2 with:
We’ve heard from players saying the game does work on some headsets not listed here but we haven’t been able to test them ourselves. If your headset is not listed above, we can’t guarantee compatibility, and suggest you request a refund through Steam if you are having trouble getting the game to start.
Try closing the game, making sure Steam VR is open, and launching the game from within the menus inside your Steam VR headset instead of launching it using the Steam desktop app.