I had a problem where I was getting this message when submitting forms. WordPress 5.3.2, CF7 Version 5.1.4. I’d made no changes to the site recently, the form just stopped working.
None of the solutions mentioned on the forum worked for me, though they pointed me towards spam protection. I don’t have Akismet on my site, but I did have the NoCaptcha V3 keys in the integration tab. Clicking “remove keys” solved it for me, and I’m posting this here in case anyone else runs into this problem.
I now have zero spam protection, so we’ll see how that pans out.
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