When setting up your two-factor authentication you will receive backup codes that can be used to recover access to your account in the event of a lost or misplaced 2FA client.
In case you don't have any backup codes yet you can get them from your authentication settings page.
If you’ve lost access to your two-factor authentication key (ie, your phone was
reset) and don't have any backup codes, please file a support request. We will validate your identity and get you back up and running.