I found that to test VR in studio, you had to turn on and connect VR before opening studio since it fails to recognize if a headset gets connected after initial boot, but even then I remember it only working half the time.
Can’t really say much else since I haven’t been able to use VR on roblox for the past year due to amount of gymnastics I have to do to get my Vive’s buttons recognized by roblox.
VR mode doesn’t launch when the graphics mode is set to Vulkan, try switching studio’s graphics mode to Direct3D11, then VR mode should be able to launch.