The reCaptcha was working great until reported to me as not working today.
I have identified the following:
The reCaptcha JS is loading successfully
The reCaptcha is working well on the form -- creating the element, checking the box and adding an encrypted string to the g-recaptcha-response textarea element that is created by the library.
However, on the server I am seeing no value for $_POST['g-recaptcha-response']
When I var_dump the $_POST array in PHP, I see all other form values but not this one. It does not exist as an index in the $_POST array