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If you created a username email@example.com with password, then a user is created in the user collection. Then if you log out and use Facebook, whose email is also firstname.lastname@example.org, to log in (with Facebook), you actually created another user whose username is also email@example.com. This is a violation of unique username. Then many errors will follow....
Can you create this as it's own thread? The last reply on this was about 2 years ago, so the information contained within is outdated and will not accurately reflect the issue you're running into.
Fabrício Massula Dutra
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