You may lose access to your account if you lose access to your authentication app (Google Authenticator, Authy, etc). For instance, if you’ve deleted the Authenticator app or lost your phone. You can try to regain access with a backup key if you saved it at the moment of 2FA configuration.
If you have no backup key, please email firstname.lastname@example.org from your account email address. You’ll need to answer security questions so that we can verify you and temporarily disable 2FA. It will help you to log into your account and realign your two-factor authentication.