title: CloudKit subscriptions not saving on iOS10
body: <p>I'm following the <a href="https://developer.apple.com/videos/play/wwdc2016/231/" rel="nofollow">'CloudKit Best Practices' WWDC talk</a> about adding subscriptions, which seems to have changed in iOS10.</p>
  
  <p>The code below returns a 'Success!', however my 'AllChanges' subscription never appears in Subscription Types on CloudKit Dashboard.</p>
  
  <p>I'm on Xcode 8 beta 6.</p>
  
  <pre><code>    let subscription = CKDatabaseSubscription(subscriptionID:"AllChanges")
      let notificationInfo = CKNotificationInfo()
      notificationInfo.shouldSendContentAvailable = true
      subscription.notificationInfo = notificationInfo
  
      let operation = CKModifySubscriptionsOperation(subscriptionsToSave: [subscription], subscriptionIDsToDelete: [])
      operation.modifySubscriptionsCompletionBlock =  {
          (modifiedSubscriptions: [CKSubscription]?, deletedSubscriptionIDs: [String]?, error: Error?) -&gt; Void in
  
          if error != nil {
              print(error!.localizedDescription)
          } else {
              print("Success!")
          }
      }
      operation.qualityOfService = .utility
      privateDatabase.add(operation)
  </code></pre>