Problem “You must enter the correct captcha.”

Hello,

I get this error “You must enter the correct captcha.” when using v2 or v3 captcha. First I had an error, because “allow_url_fopen”  in php was off. I And after switching on, I get this:

Warning: file_get_contents(https://www.google.com/recaptcha/api/siteverify): Failed to open stream: HTTP request failed! HTTP/1.1 400 Bad Request in /usr/www/users/eegwie/webspace_eegwien_at_wp_multisite/wp-content/plugins/recaptcha-for-asgaros-forum/src/ReCaptcha/RequestMethod/Post.php on line 72

And this is in line 72:

$response = file_get_contents($this->siteVerifyUrl, false, $context);

I also allowed “allow_url_include” in php, but no change.