Any special for Cloudflare an Google reCaptcha V3?

Hello,
I maintain 2 websites https://www.finksoftware.de and https://www.fp-lims.com on both websites I have set up Google reCAPTCHA. At finksoftware.de it ran immediately. The fp-lims.com page is protected with Cloudflare, but I still want to use the ReCaptcha to subscribe to the newsletter. but I can’t do this, as soon as I turn it on the backend I get the following error on the website: Error message for website owner: Key type invalid

Do I still have to set, change or release anything in the Cloudflare backend setup?

Thank you very much for your support.

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