Hello, this question has been asked many times. The fact is that the structure of storing joomla fields is not optimal (this is a question for the developers of the Joomla core), if we start calculating possible filtering options with certain parameters every time, it will be a very large load on the hosting.
The problem is that part of the code was removed from the Facebook plugin
Because of what your site does not ask for an email address from Facebook
I solved the problem by adding some of the code to \plugins\slogin_auth\facebook\facebook.php
= implode(, );
= . ;
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