Can’t make Facebook login to work

Hi,

I can’t seem to make the social login extension work with Facebook.

I’ve followed every single step of this guide already: https://userswp.io/how-to-add-facebook-app-login-to-your-wordpress-website/

My website: https://www.ruamsale.com
Login url: https://ruamsale.com/login-2/
Register url: https://ruamsale.com/register-2/

When attempting to login, Facebook does popup with the profile name and saying “It will get your emails information” like what should be happening, but after you accept, it then redirects again to ruamsale website but with the “Oops! That page can’t be found.” error.

Any comments appreciated,

Kanit.

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