[rodric]

You should probably use an app like Aegis (Android) or Raivo (iOS) for two-factor authentication rather than your personal phone number.

[therealmarv]

FB does not allow you to use 2FA apps like that without giving them a phone number first (at least this is how it worked in the past).

[rodric]

Shame if that is (or was?) the case, but it hasn’t been my experience at least.