invalid ‘site_id’ or ‘site_secret’ |

Hello, just tried to set up Site Kit to my WordPress page. Says:

/Connect your Google account to Site Kit
Site Kit has already been configured by another admin of this site. To use Site Kit as well, sign in with your Google account which has access to Google services for this site (e.g. Google Analytics). Once you complete the 3 setup steps, you’ll see stats from all activated Google products./

When I hit Sign in, it gives me this:

/The request to the authentication proxy has failed with an error: invalid ‘site_id’ or ‘site_secret’ Get help./

I find no instructions to act on this message … Please advise.
Thank you!

The page I need help with: [log in to see the link]


This site will teach you how to build a WordPress website for beginners. We will cover everything from installing WordPress to adding pages, posts, and images to your site. You will learn how to customize your site with themes and plugins, as well as how to market your site online.

Buy WordPress Transfer