I have a Google Cloud Platform service account that I want to enable to read the emails of my G Suite account. However, when I follow the prescribed procedure of authorizing the service account as a client in the G Suite admin interface (Security -> Manage API client access), the form fails with the error 'This client name has not been registered with Google yet.'. I supply the client ID of my service account key file for client name.
What am I supposed to supply for client name, so that it works?