Help:Two-factor authentication: Difference between revisions

When setting up two-factor authentication, you will be given a list of '''fiveten''' scratch codes. These codes can be used during the verification code step after logging in if you lose access to the mobile device you used to set up two-factor authentication, if your 2FA app got uninstalled or reset, or if the codes your phone is generating aren't working and you've been unable to resolve that problem. '''These codes only work once''', so once you use a code, that code can never be used again. Scratch codes are never shown again after you've set up two-factor authentication, so make sure you write them down somewhere!