Google forms - The operation failed with an error. 403: PERMISSION_DENIED - The caller does not have permission

Google forms API has been enabled with Google drive API, and others.

But still cannot trigger actions from google forms in Make, the scopes have been entered Client credentials

Welcome to the Make community!

You also need to enable all the relevant scopes. If you are unsure, just enable all first.

Please refer to Use Gmail Settings API with HTTP Make an OAuth 2.0 Request to get Signatures - #4 by samliew for instructions on how to add scopes to your GCP OAuth application consent screen.