Hello @Marcelo_Chat,
Welcome to the community!
If you’re using n8n Cloud, the platform utilizes a pre-verified Google OAuth2 application. This means that when setting up credentials you’ll typically see only the “Sign in with Google” option, without fields to manually enter your Client ID and Client Secret. This streamlined approach is designed for ease of use and quick setup.
if you prefer or need to use your own Google OAuth2 credentials I think you’ll need to self-host n8n. In a self-hosted environment, n8n allows you to manually input your Client ID, Client Secret, and other OAuth2 parameters.
I share here similiar issues, hope it helps:
Cheers!