If you did not complete the set-up, you will be logged out of your account. If you face this issue, please write in to firstname.lastname@example.org.
Planning to reset/change device - how to get back 2FA secret key?
If you're doing a planned device change, resetting device, etc., head into your User CP options and disable the 2FA first. You can enable it back again after setting up your device, which would then throw up the QR code to re-enable your 2FA.