After logging in with Facebook CK, how can I properly bind an email address and enable two-factor authentication (2FA)

You can try asking for system support; if the account is too bad, you can buy a verified account to replace it.
 
You might want to explain the issue in a bit more detail so people can understand what’s happening. The more info you share (error message, screenshots, what you already tried), the easier it will be for someone in the community to help you.
Most people here are happy to help if they can.
 
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