I tried installing the Invisible ReCaptcha Plugin plug-in
We set the data correctly on the reCaTCHA page, added key and secret data to the plugin, added the two scripts to the head.php page.
On the page, at the bottom, the "Privacy - Terms protected by reCAPTCHA" logo appears, but I get the following message:
Error: ReCaptcha failed (Unable to get recaptcha parameter, invisible recaptcha form was probably not added to this page.)
Where did I go wrong?

@Dan Dan
You have already created support ticket, continue with communication there.