I’ve had issues with this when I first tried out Niantic Studio ( I was hoping to use it as part of a game jam )
Just keep trying it - and if you come back in a few hours after a break, try it again - I couldn’t see a pattern to it not working.
I just updated a physics test I made earlier to use XR, so you have another link to test ( if one goes down, see if the other is down also - might help identify the issue )
