I'm on an Index and having the same problem, so I'm guessing it's not the headset. Gonna keep screwing around with it to see if I can get it working. Already tried launching with OpenComposite but just got libOVR errors.
As far as I can tell it looks like a shader issue causing a Unity crash. Found this in the log In AppData\LocalLow\AoQ\AttackOnQuest:
WARNING: Shader Unsupported: 'Hidden/Nature/Terrain/Utilities' - All passes removed
WARNING: Shader Did you use #pragma only_renderers and omit this platform?
ERROR: Shader Hidden/Nature/Terrain/Utilities shader is not supported on this GPU (none of subshaders/fallbacks are suitable)