I have a form on this site for users to register. Some of those users are in China. They are not seeing the recaptcha on the page as it’s being served from Google servers which are blocked in China. Since they don’t see it they can’t complete validation and they can’t submit the form.
This is a known issue https://github.com/google/recaptcha/issues/87
First, replace <script src="https://www.google.com/recaptcha/api.js" async defer> with <script src=“https://www.recaptcha.net/recaptcha/api.js"async defer>
After that, apply the same to everywhere else that uses “www.google.com/recaptcha/” on your site.”