Hello,
This is not our plugin issue. It’s all about your created API issue. Somewhere your API is still not available for production. Maybe it’s set for a test purpose. That’s why you are available to access when you are logged in.
Moreover, we need a full-page screenshot of your “Enabled APIs & Services” and “OAuth consent screen” of your project on google console https://prnt.sc/F9yzJuPeHq8w
Please provide a full-page screenshot, not only the visible part of the screen.
Best Regards,
ThemeLooks Support Team