Cloudflare Turnstile element in the Cornerstone Forms

Hi!

I am experiencing an issue with the native Turnstile element within Cornestone Forms.

Cloudflare Analytics shows quite a few Challenges Solved but 0 Siteverify requests (only my manual request was recorded in the analytics, see below). The form (Action: Send Email) submits successfully and sends the email, but it does not seem to trigger the server-side verification call to Cloudflare.

Everything is updated, I disabled the caching plugin too.

What I looked into:

  • cf-turnstile-response is present upon submission.
  • a manual wp_remote_post test from this server to the Cloudflare siteverify endpoint, it was successful.
  • both site/secret keys are correct

You can see an example form here: https://tavia.cz/kontakt-test/

Thank you for your help!