I have two Hubitat c-8s, each in a separate house (different States). I have one Google Account with two Google homes. I just set up the second C-8 with the second Google home and it linked fine, I go back to the first home, and the first C-8 is no longer synced with the first Google home. And I can not get it synced. Google first says it is synced, then says "something went wrong, try again". I have rebooted the first C-8 and tried several times, but I get the same error and the devices are no longer linked. Do I have to have a separate Google Account (one for each C-8)?
There are more than a few Topics covering the fact that neither Google or Amazon allow multiple hubs. However, they certainly allow their own multiple accounts. Bottom line, you'll need an account per hub.