"The developer hasn’t given you access to this app. It’s currently being tested and it hasn’t been verified by Google. If you think you should have access, contact the developer"
i don't understand because i have put the url in GCP ...
David, this error looks like the permissions aren't set up properly for the user. Are you able to test development access for this connection string from another app to verify the error message?
@Amanda , i m not sur to understand your question . Sorry if my answer is not correct .
I can connect an another app to my different google agenda like with a project on https://www.make.com