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your fifa account has bound to facebook,and if you want our account ,you need unbind  from your facebook account ,then send us your facebook account ,disable the security verify,or give us at least two recovery  will bind the purchased fifa mobile account to your facebook.
you have bound your fifa mobile account to your facebook account and you want keep your own account ,you can register another or buy a new facebook account,then we send us your facebook account ,we will bind to your new facebook account,once you play fifa mobile ,you can switch  to log in your new facebook account.