Facebook Login Not Working Returns Status 0

Hello
Attempting to set up front end client login.

Both Twitter and Google+ are working as expected but not getting any love with the Facebook integration.

Trying to debug from inspector I can see that admin-ajax.php is being called and returns :
{"status":0}

Attempted many different scenarios such as:
1) Disabling plugins such as Yoast that may be also adding FB scripts
2) Checking and Unchecking "My website already uses Facebook" checkbox from Appointment+ settings
3) Gone over FB App settings (There may still be an issue here if there is anything specific that is needed for your integration to run smoothly but I have ensured the App is set up, emails and urls etc have been added and it says it is live)

Our theme is Jupiter 4.0.9
WP is 4.3.1

Any suggestions are appreciated.
Thanks