title: Event Grid Trigger Not Firing For Azure Functions
body: <p>My Azure Functions Event Grid trigger is not firing. Here's what I did.</p>
  <ul>
  <li>Key Vault is set-up to report the <code>Secret New Version Created</code> event to an EventGrid system topic</li>
  <li>This topic is subscribed by a subscription delivering the events to an Azure Function</li>
  <li>The functions has an Event Grid trigger (see below, default created by portal):</li>
  </ul>
  <pre class="lang-cs prettyprint-override"><code>#r &quot;Microsoft.Azure.EventGrid&quot;
  using Microsoft.Azure.EventGrid.Models;
  
  public static void Run(EventGridEvent eventGridEvent, ILogger log)
  {
      log.LogInformation(eventGridEvent.Data.ToString());
  }
  </code></pre>
  <p>I googled, and there is not much more guidance for such an entry-level scenario. What I am thinking about maybe is authorisation... How is the subscription able to trigger the function? In the process (configured via GUI/portal) there was nothing about auth...</p>
  <p>Do you have any idea why events are not firing?</p>
  <p>Cheers</p>