With two-factor authentication, your account can only be accessed on devices you trust, like your smartphone or personal computer. When you want to sign in to your Bittrex account, you'll need to provide two pieces of information—your password and the six-digit verification code that's automatically displayed in your authentication app.
If you are having trouble with your two-factor authenticator, your device may not be syncing. The typical reason for two-factor failures is that the clock on your phone has drifted. We only have a two minute window for 2FA confirmations so if your clock has drifted beyond that, you will not be able to log in. Please make sure your phone is configured to sync your time with the cellular network.
You may need to remove two-factor authentication from your account for several reasons. For example, your phone may have been lost, require a factory reset, or you may be upgrading your device. As this code can only be accessed on devices you trust, you will want to remove the 2FA from your account prior to device changes if possible.
Our full article on 2FA can be found here (Two-Factor Authentication (2FA)). If you encounter issues accessing your account due to two-factor authentication (2FA) issues, please submit a support request on our support site: https://bittrex.zendesk.com