The Log for the hub shows repeated "resource exhausted" messages from the Google Home app
Hard to know if it's a blip on HE's side or Google's side...
First thing I do for this sort of thing is go to the Google Home integration in HE (I just use the native integration) and hit the "Done" button there.
I wait a minute or so, and then I tell my Nest Hub (or whatever other Google speaker thing) to "Sync my devices"... If there's a failure, Google should tell you then.
Did that, and the devices all still say "offline". If I try to use GH to reconnect the hub, the oath.cloud.hubitat.com link seems to fail.
The message that shows is "the parameter "state" must be set in the query string"
Rebooting the hub from Settings appears to have fixed the problem for now.
I have this issue every few weeks. The cause and solution (other than a reboot as a temp fix) seem to be elusive.
How long did you have things running before this happened?
It would be amazing if you could recall any changes that you made in the run up to this happening.
I've been using the Hubitat with Google home for over two years and never had this happen. Prior to the problem, I had added a virtual device and a new outdoor outlet, but it worked for several days after that. This morning, I changed the status attribute for devices/rooms on the virtual switch to "switch" from "none", but I don't know whether the problem had already occurred at that point because I didn't try to use the Google Home link.
Trying to think back, I believe that when I first added the virtual device, it showed up in Google Home when I selected it, but then disappeared. I was wondering if it might not show because of the status attribute setting, which is why I tried to change it. Before I rebooted the hub I put the attribute back to "none" and I also deselected the virtual device for Google Home. That's how it is set up now, and it works. I have no other virtual devices. My outdoor smart plug was the Minoston MP22Z, but it doesn't have a specific driver of its own so it's set up as a generic outlet.