Facebook: Six Digit Code

Authenticator apps rely on precise time (UTC). If your phone’s clock is off by even 10 seconds, the code will fail. Go to Settings -> Apps -> Google Authenticator -> Sync time. Fix for iOS: Ensure "Set Automatically" is enabled in Settings -> General -> Date & Time.

Tools like Google Authenticator or Microsoft Authenticator generate codes that refresh every 30 seconds. facebook six digit code

Here is how it works conceptually: