CF Turnstile always invalid response [Error: 600010]

Hi,
I am writing to report the following bug related to the Cloudflare Turnstile Add-on WordPress plugin: the captcha always returns an error.

When I submit the form, this notice appears at the top:

There was a problem with your submission. Please review the fields below

Below the captcha instead appears this notice:

Invalid Turnstile captcha response.

I see from the logs that it is an Error: 600010.

I have verified the credentials and they are correct, in fact another captcha added with custom code continues to work, so I would say the issue is caused by the Gravity Forms extension.

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