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After more than 20 attempts of integraition with facebook login I came to 2 (TWO) major issues:
Your facebook plugin asks FB for publish_actions permition and your guides does not tell what you have to do to make it work, because pure clean and fresh vanilla instance when connecting to fresh APP makes FB to respond like that: "Submit for Login Review
Some of the permissions below have not been approved for use by Facebook." - and there is actually nothing more in this note but I have found publish_actions in your script in scope section.
Even I have tried so many times, every time exactly as your guides say. Even I have try to find solution here (change in code, replace plugin with the one on Github) etc. etc. There is always the same conlusion: UniqueID is required. !
Settings (app id, secret key, app settings) are OK because if they were not I would not be able to go through FB auth and APP connection ... something is wrong later - when after sucesful connecting FB is sending me back and vanilla seems doesn't recognize facebook profile details.