title: Facebook Graph Api returning empty data for Ad Insights API
body: <p>I am trying to fetch reporting for the AdCampaign let's say with xyz id, I have valid access token with ads_read, read_insights permissions &amp; everything else except page_messaging. The app with the permitted token is owned by same ad account as well. </p>
  
  <pre><code>xyz/insights?fields=ad_name,....
  </code></pre>
  
  <p>No matter which fields I ask for, it always return me empty data set.</p>
  
  <pre><code>{
    "data": [
    ]
  }
  </code></pre>