From my searching and reading, it appears as though this is an ongoing issue.
I had to reset my google home community integration and when I went into the google home app to add the Hubitat integration, I get the " The Parameter "state" must be set in the query string" error.
I set it up this AM, and it's a full 4-6 hours later and I'm still experiencing this.
Hubitat Elevation® Platform Version: 22.214.171.124
Hardware Version: Rev C-7
I think I'm going to recreate the integration one more time. Any other suggestions?