pixel tablet as auditor

I'm trying to understand why my pixel tablet can't work as auditor on my pixel 7 audite

I successfully did the auditor with the pixel tablet on a pixel 8 but it doesn't work on the pixel 7

Also worked as auditor pixel 8 with the 7 audite

Is this maybe the camera of the pixel tablet not being enough good ?

I have a screen protector on the pixel 7 so maybe it makes things more difficult to the camera of the tablet

The pixel 8 is also protected with a screen protector from another brand

Both are good screen protector without scratches or anything else

I've run into the issue as well. Specifically with a Pixel 7 and Pixel Tablet, both without screen protectors.