farmguy

It looks like I’m having the very same problem. I’m using CF7 5.1.7 and CC 1.8.2 on WordPress 5.4. I was originally started out using just CF7 and a set of keys and had no problems with reCAPTCHA V3. I later found out that we had an existing CC account so I added in CC and a form to try it out. I used the same CF7 reCAPTCHA keys. I got the “Failed reCAPTCHA check” message all the time. After reading your post I tried creating a new set of keys for CC, but this did not help. Still the same error.

However, if I deactivate CF7, it mysteriously works. So it seems there is some incompatibility between CF7 and CC and reCAPTCHA.

Here are the last few debug log entries. In each case I was trying to signup using my new CC newsletter sign up form. I still had separate keys for both CF7 and CC for this test:

Before CF7 deactivated, which failed:
[2020-04-30 05:55:56] reCAPTCHA.INFO: Failed to verify with Google reCAPTCHA [“Extra information”,[[[“invalid-keys”,”hostname-mismatch”,”action-mismatch”,”score-threshold-not-met”]]]] []

After CF7 deactviated, which worked:
[2020-04-30 06:01:28] API.INFO: Contact set to be updated [“Extra information”,[{“form”:”Newsletter Signup”}]] []
[2020-04-30 06:01:28] API.INFO: Submitted contact data [“Extra information”,[{“email___36b4fb1372470c37ba73f3453ab693c2”:{“key”:”email”,”val”:”***@gmail.com”},”email”:”***@gmail.com”,”list”:”1742301589″}]] []

After CF7 reactivated, which failed again:
[2020-04-30 06:03:23] reCAPTCHA.INFO: Failed to verify with Google reCAPTCHA [“Extra information”,[[[“timeout-or-duplicate”,”hostname-mismatch”,”action-mismatch”,”score-threshold-not-met”]]]] []