title: Why is my Facebook AppInviteDialog request not being received by target friend?
body: <p>In short: Everything seems to be working on the client side, but nothing received for the Facebook target friend.</p>
  
  <p>These are the detailed steps with code and screenshots:</p>
  
  <pre><code>AppInviteContent content = new AppInviteConent.Builder()
      .setApplinkUrl("App link url created via the Facebook AppLink creator tool")
      .setPreviewImageUrl("http://www.redacted.com/previewImage.png")
      .build();
  
  appInviteDialog.show(this, content);
  </code></pre>
  
  <p>This results in a dialog being shown with a preview of a link to the install of the app, and the option of entering a message at the top:</p>
  
  <p><img src="https://i.stack.imgur.com/qO9SZ.jpg" alt="screenshot"></p>
  
  <p>I then click next, select one or more friends and click the top right Send button:</p>
  
  <p><img src="https://i.stack.imgur.com/KqKyy.jpg" alt="screenshot"></p>
  
  <p>The result is a seemingly successful send:</p>
  
  <p><img src="https://i.stack.imgur.com/yvkCv.jpg" alt="screenshot"></p>
  
  <p>I attached a callback as well to make sure it was actually a successful send:</p>
  
  <pre><code>appInviteDialog.registerCallback(facebookCallbackManager, new FacebookCallback&lt;AppInviteDialog.Result&gt;() {
      @Override
      public void onSuccess(AppInviteDialog.Result result) {
      Log.d(TAG,"onSuccess result = "+ result.getData().toString()); 
      }
  
      @Override
      public void onCancel() {}
  
      @Override
      public void onError(FacebookException e) {
          Log.d(TAG,"onError message = "+ e.getMessage());
      }
  });
  </code></pre>
  
  <p>This prints out "onSuccess result = Bundle[{didComplete=1}]"</p>
  
  <p>Expected result: Friend receives a notification.
  Actual result: Friend receives nothing.</p>
  
  <p>Some more information that might be helpful:</p>
  
  <ul>
  <li>App is only available on android. </li>
  <li>Notification is not received on any platform including Facebook android app.</li>
  <li>The App link url has been confirmed working by clicking on it in the Facebook android app. (It creates a popup linking to the Google Play Store)</li>
  <li>Single Sign On has been enabled and user is logged in, although should not be necessary according to the AppInviteDialog documentation on Facebook.</li>
  <li>Tried this with the target user not already having authorized the app, and also with user that already had the app installed. Same results. </li>
  <li>The Facebook SDK version I am using is 4.0.0</li>
  </ul>
  
  <p>It's frustrating because everything seems OK, and there is no way (that I know of) to debug this problem.</p>
  
  <p>I hope someone can help me or point me in the right direction.</p>
  
  <p>Thank you!</p>