Google 2FA

Two-Factor Troubleshooting Tip

The typical reason for two-factor failures is that the clock on your phone has drifted. We only have a two minute window for 2 FA confirmations so if your clock has drifted beyond that, you will not be able to login. Please make sure your phone is configured so sync your time with the cellular network

Backing up the secret key

The secret key is displayed just below the QR code when you first enable two-factor. You can write this code down and keep it in a safe place. You can also snap a picture of the QR code and print it out and keep in a safe place. You can then enable two-factor from another device using the secret key, should you lose or damage your existing device. If you did not write your secret key down when enabling 2FA, you will need to disable 2FA and write the secret code down when re-enabling 2FA.

Problems with Google Authenticator

Please refer to Google's documentation on their product here:
https://support.google.com/accounts/answer/1066447
If you are using a new phone, you will need to transfer your Google Authenticator to your new phone and manually add each app with the secret key or QR code you initially used to enable it. Please refer to this article about this process.
https://support.google.com/accounts/troubleshooter/4430955
You can see the following contents from the link above.