How to fix Google AdSense error the server responded with a status of 400 (Bad Request)? If your site got just approved By Google to show ads by using Google AdSense, it could be the case that you see this error.
In most cases you should just wait until Google is able to show the ads on your page. But if you want to know why this is happening you can read article about it here:
https://floyk.com/en/post/how-to-fix-adsense-error-server-responded-with-a-status-of-400