If you lose your mobile device or don't have access to your device, therefore you are not able to enter your Two-Factor authentication code at the time of log-in, you can use one of the recovery codes that were presented to you at the time of enabling Two-Factor authentication.
Important: These recovery codes are one-time use only and will expire once a code is used to successfully log in.
Note: Make sure these recovery codes are stored securely so that no one other than you can gain access to them and use them.
If you need further assistance, please feel free to write to firstname.lastname@example.org with your queries. We're more than happy to help.