Login as admin Navigate to Site administration ► Plugins ► Authentication ► Manage authentication Ensure the string make sense for "recaptchaprivatekey" Ensure the string make sense for "recaptchapublickey" Ensure the string make sense for "configrecaptchapublickey" Ensure the string make sense for "configrecaptchaprivatekey" Ensure Google reCAPTCHA link is working and it gets redirected to https://www.google.com/recaptcha Go to https://www.google.com/recaptcha Add the details to your site (you don't need to have your site publically available, just use the normal address you use Copy the site key to site key and secret key to secret key Enable the email based self registration authentication plugin Set self registration to email-based self registration Go to email-based self registration settings Set "Enable reCAPTCHA element" to "yes" Log out or open an incognito/in private window in your browser. Check that recaptcha displays, and you can successfully register