Enter a New 2FA PIN on iOS 14 (or earlier)
The 2FA code expires automatically after three months by default. In addition, it expires when you switch to a different user, change your password, reset a PIN, or tap Forget me on this device on the Settings screen. In these scenarios, you must enter a new 2FA PIN.
To enter a new 2FA PIN:
Parent Topic: Set Up 2FA on iOS 14 (or earlier)