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.
You are not following what we are asking for. Please provide a screenshot of the list of APIs & Services you added to your API. We need to get clear you added all of the API services mentioned in the documentation.
Please don’t forget to give us 5-Star ‘rating and review’ (on https://codecanyon.net/downloads ), if you like our item and our support too. It will give us inspiration and make us more ‘happy’ to provide exclusive support.