Followed these instructions
https://docs.n8n.io/integrations/builtin/app-nodes/n8n-nodes-base.googlechat/
and then set up a Service account (that is the only one that is supported for Chat) from Google - n8n Documentation
The credentials work.
I see API calls made in the Goggle Cloud Console
BUT it appears I am missing an undocumented step in this process.
I see some people in the community chats have got this working.
Asana and Google Chat not coexisting
What did I miss?
Do I need to create an APP on GCP as the error message suggests?
Thanks