These steps assume that the Google Home has been previously paired with Home Assistant, and the settings in the Google Cloud API pages are correct; the Home Assistant has been installed and is accessible to the internet via a https page; and the users are correctly set up in Home Assistant.
1. In The Google Home App, select your Google Account icon, and 'Home Settings'
2. Select 'Works with Google'
3. Select the '[test] Home Assistant'
4. Select 'Reconnect account'
5. On the 'Link and account' page, select 'Continue'
6. On the next page, select 'Agree and continue'
You will then be taken to your login page for Home Assistant. DO NOT put your username and password in on this page.
7. in the '...' menu on the top right, select 'Open in Chrome Browser'
8. Now put in your username and password
9. Finally, select 'Open With ... Google Home'
