Looks like you’ve run through a lot of the tests already, so the only thing that might help them to determine the problem is to run through the hotspot setup:
Pip has some instructions here:
https://community.glowforge.com/t/displaying-as-calibrating-then-reverting-to-offline/27308/18
Just post the results of that test here and they might be able to make a determination when they see it. (Might save some back and forth time.)
Good luck!