When submitting your app for review, you’ll be asked whether your app uses the Advertising Identifier (IDFA) to serve advertisements. If you indicate that your app uses the IDFA, but it does not have ad functionality or does not display ads properly, your app may be rejected. Make sure to test your app on an iOS device to verify that ads work correctly. Similarly, if you indicate that your app does not use the IDFA, but it does, your app will be put into the “Invalid Binary” status. Learn more about the IDFA in the iTunes Connect Developer Guide.