reCaptcha error 400

Question

On a Webpage, when I click on "I'm not robot" checkbox, the Google Recaptcha load infintely and on my JS console I have some error 400 :

My Key is OK, I use same on an other website and recaptcha work fine, I have this problem only on a specific Website.

Answer 1

In my case, I use the wrong Google reCaptcha version. I create v2 in reCaptcha console but used JavaScript of V3 code.

Answer 2

I had multiple Captcha plugins installed and uninstalling and removing them fixed the issue for me.