If you’re a new user, then there will be no codes until you connect our 2FAS app with a service of your choosing.
If you’re a returning user and you’re wondering where are the codes that you had in the past, then an easy way to get them back is to turn backup on from the settings. The codes should reappear immediately back on your home screen. Please watch the video tutorial here to see how to connect our app with different services: https://2fas.com/tutorial/.