I get an error message when I try to login using Facebook Login

I have tried to login with 3 different web browsers, and I have tried a private browser as well. I get the same error message in the screenshot as soon as I click "Login with Facebook". I already tried to contact support once, but it looks

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I am getting the error message “Insecure Login Blocked: You can't get an access token or log in to this app from an insecure page. Try re-loading the page as

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