HI Caden, thanks for the note, though posts like this may be best to review with our fantastic support team. That being said, I'm guessing that the Google account you are using is a "personal Gmail". At this moment personal Gmail accounts cannot be used due to increased privacy restrictions set in motion by Google. Only business Google accounts are currently supported.
I get the same message with my G-Suite corporate account. Interestingly, I can still create connections in legacy Fusion. I'll post the solution if I get one.