title: iOS In App subscription - "A marketing opt-in incentive cannot be offered with this app"
body: <p>One of our applications offers IAP, some consumable and some auto-renewable subscription.</p>
  
  <p>When trying to add an (or to modify an existing) auto-renewable subscription, iTunes Connect displays this label in the "Add duration and pricing window" :</p>
  
  <blockquote>
    <p><em><strong>A marketing opt-in incentive cannot be offered with this app.</em></strong></p>
  </blockquote>
  
  <p>Does someone know how to enable opt-in at application or appId level?</p>
  
  <p>Thanx</p>