Using a device that you have already logged into to approve the new login.
the text message from Facebook; it explicitly states: "Don't share this code with anyone." facebook six digit code
Someone was hammering at the door of his digital life. He sat up, the blue light of the phone casting long, jagged shadows against his walls. He opened his laptop, hands trembling slightly. He tried to log in himself, but the password he’d used for years was "incorrect." The intruder had already changed the locks; they were just stuck on the final deadbolt—the Two-Factor Authentication. Using a device that you have already logged
If you have no backup codes and no trusted contacts, you must prove you are the real owner. He opened his laptop, hands trembling slightly
Legitimate support will never ask for your six‑digit code. If someone asks for it, block them immediately and report the account.