My team and i created a babylong angular project. And one of the features was viewing the 3d file in augmented reality, i had a marker object and on detection of flat plane it renders the 3d file. I used webxr for this, and i was testing on my samsung galaxy a71. A week ago i got a new phone galaxy a55 a newer model and tried my project but the xr is not working anymore although i can see in the browser that all the permissions are working correctly. I tried other xr projects and same issue. What doesnt make sense is that the phone is a way newer model and my chrome is the latest version.
This does not seem like a bjs issue but maybe @RaananW has some clues 
Some devices don’t support AR. You can try installing the ar core services, but i believe it is no longer available in the play store and should come directly with the os.
I can also say that on a galaxy s23 i tested, XR didn’t work on Chrome, but did work on Chrome Canary. The reason is still unknown to me. Chrome only stayed working after a complete reset of the phone. Maybe worth the try