Archer c50 facebook wifi isnt working.

the problem is that the guest network is without authentication and dont use the advertiset facebook check in / log in to use the wireless network for free.

the router has been updated to the last firmware and rebooted.

in the section of the guest network the facebook wifi is enabled and everything has been set up.

facebook page is up and running and verified as location and business page. in facebook all seems ok.

still says: Facebook Check-in Location:None and the users can log in to the guest wifi without the router redirecting them to the fb business page to check in and have all unrestricted access to the net.

Now can tp link explain what is happening and how to resolve the issue that the facebook wifi doesnt work?

the model archer c50