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I had encountered TWICE, of Apple reviewers rejecting 2 of my apps because while testing, they encountered an error with Facebook login.

The errors they might have seen are:

com.facebook.sdk:SystemLoginCancelled

or

The user is not allowed to see this application per the developer set configuration.

or

Login failed with error code 800 error 800.
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Once again, I am disappointed with Parse official rep answers, which are, again, wrong.

It is NOT possible to change the error code or message of a response. It will always be status code 141 (Parse Script Error) when you do a response.error(...).

The best you can do is to pass a json as a message.