@craxiss friend i fixed this error. Sorry for my poor engilish. I want help you.
I added new steps for you. Follow them.
First switch your “https://” to “https://” in WordPress General Settings configuration.
Now deactivate your all plugins except the site kit plugin. Just site kit must stay active. Deactivate others all.
If you deactivated your all plugins logout from your admin panel and relogin.
Now switch your “https://” to “https://”.
Now connect to your site kit..
If all is ok reactivate your plugins and enjoy.