I have the same problem, I cannot get my users authenticated with Facebook plugin.
I am using version 4.3. In facebook configuration I used https://www.example.com/signin-facebook as my oauth redirect page, with the other settings previously mentioned, but when I enter this address in the browser an hit ENTER my site says this page does not exists. I think this explains the fact that when my users enter correct fb credentials in my site nothing happens, they remain in the login page. Please help.
So you entered https://www.yourwebsite.com/signin-facebook
What is your website address ?
My site is https://www.mercadone.co
I have it working on v4.3 OK
Your site is Secured OK
Check you entered https://www.mercadone.co/signin-facebook correctly and the other settings are the same
You tried restarting your webserver ?
Then only last thing you could try is uninstall and reinstall the Plugin
Trying to fix the previous problem with Facebook auth plugin in version 4.3, I uninstalled it from the admon web interface. Now I cannot get it loaded again in local plugins. I install it again and again loading the zip file through web interface or copying manually the folder, I restarted server, restarted machine, deployed again the solution and nothing works, the plugin is not listed.
I can see that FB plugin DLL is not copied to the plugins/bin folder, and it is deleted automatically if I copy it manually.
Any idea? Thanks!!