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Hello, I seem to get this message when ever I try to register on my own site as well as when my friends do, please help, here is a GIF of it.
I had the exact same problems (with 2.4 beta though, as 2.3 didn't work at all). The problem lied in the keys you get from Google. I copied them and it turned out there was a mistake - maybe a whitespace too much. Try to copy them again very carefully and let me know if it worked!
I have invisible captcha and it works excellent, with plugin No Captcha ReCaptcha, work perfect,