At the very end of the validation process of your application on iTunes Connect, once you have clicked "Submit for validation", you will be redirected to a form.
In this form you will find a statement with several choices concerning the Advertising Identifier (IDFA).
The IDFA is activated by default in your Apollo Apps applications. You cannot deactivate it.
Therefore, you must ALWAYS respond YES to the question "Does this app use the advertising identifier (IDFA)?"
1. How to fill out the form