Thanks.
It was Google side issue, definitely, which has been solved now. I was able to configure Google Assistant to communicate with my Home Assistant, but I also needed to make one change in HASS configuration. Previously I had this in configuration.yaml:
project_id: home-assistant-XXXXX
api_key: !secret google_api_key
expose_by_default: false
exposed_domains:
- light
and it worked fine in the past.
Now I needed to set expose_by_default to true, to have my HASS devices listed in Google Assistant App. If it’s set to false, I’m able to connect Google Assistant with Home Assistant, but I don’t get the list of devices exposed by Home Assistant.