Hi @rodge
Thank you for reaching out to us!
I was able to find that, in addition to enabling “Less Secure Apps” when configuring your application, you will also need to create and use an app password, reference from a different Community post. I’m not 100% sure if this is still working right now, it might need to be tested beforehand.
From what I could find, SMTP using basic auth is all that we currently support when connecting to Google. We highly recommend looking over the integration types that we offer and configure a business grade email provider for production purposes.
Hope this helps!
Gerald