Apple will test your application on a real device. When they launch the application, they should be able to go through the registration process. Thus, you need to configure the system so that when the reviewer launches your application, they can perform the actions that your application requires. This means that your server must be working properly.
If any specific information (user ID, password, etc.) that the reviewer must enter into your application in order to use it, you must provide this information in the "Demo account" field for information about your application in iTunes Connect .
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