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Could you confirm whether your current implementation of "connect" request the user's email?
There was an old thread that said you did. (https://support.kinvey.com/discussion/200530858/requesting-facebook-users-e-mail-permission)
However, during my testing I could never get an email returned by Facebook even though my test user has everything set to Public.
We seem to be getting the default "public_profile", which doesn't include the email (needs to be requested explicitly in Kinvey's call to Facebook) in what's returned in _socialidentity.
I'm not certain where the problem is, but knowing how you guys are calling Facebook would help. Thanks!