Ok adding some info to this post since I'm starting to think it's not just about the Aqara cameras.
On November 3 I updated the firmware on my Eero routers. One base router and two extenders or whatever they call them. I also unplugged my two Aqara cameras and moved them to different locations while I was out of town. I returned on the 9th and moved the cameras back to their original locations. One would not connect at all, one took a few power cycles to get going. The one that wouldn't connect still won't. I read that a WiFi name with special characters could cause issues so I changed mine to just letters. Some of my stuff switched over automatically, some had to be re-setup. But some stuff won't come back at all.
Two Aqara G2H Pro cameras
Two WeMo smartplugs
iHome outdoor smart plug
Nest Protect smoke alarm
I've tried everything, or at least I think I did. Factory reset, network reset, removed the devices. Nothing is working.
Is it possible the Eero update is what caused this?