Looking back through the posts, you said you get an "unable to join" error. From my experience, that usually means a bad password. Your testing suggests you have already proved that isn't the case.
Is there any evidence on the router about what is happening? Turning logging on might give some clues. Does an IP address get allocated when you try? And from that, have you tried reserving an address for the device?
Have you tried setting up the guest access? It shouldn't be different, but it will allow you to try different things with passwords and maybe settings that won't interfere with the other devices.
You mentioned a factory reset. Something that has changed in the firmware is the URL used to check if the device has connectivity. If the URL that the factory firmware uses doesn't exist or is blocked somehow, that could explain it. I can never remember the URLs involved, but the old one was something at Apple and the new one at Microsoft.
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