I just went to set up a contact form, did the entire OAuth and GSuite process and got my Client ID and Client Secret. Went to send a test email and got the same error. I haven’t seen this anywhere else on any forums. As of the time of writing this, the thread is only 2 hours old and the plugin was updated 8 hours ago, so I wonder if it is an issue with the most recent update or on Google’s side of things?
