I installed the ReCaptchaV2 addon and put this in my form code:
<form id="contactForm" method="post" action="[[~[[*id]]]]">
I put the credentials I got from Google in the recaptchav2.secret_key and ecaptchav2.site_key system settings.
But it's not submitting. No error, nothing. What could be wrong? As usual the instructions are really non-existing in the addon.
Have you tried using Chrome Dev. Tools' console to see if there's a JS error reported?