Dialogflow Slack integration app_mention not working : <p>I was successfully able to integrate Dialogflow chatbot as an APP in Slack and it is accessible to chat using the APP tab.</p>

<p>However, for it to respond to messages in channels by mentioning like <code>@bot hello</code>
I realized that I have to add the <strong>app_mention</strong> event into <strong>Subscribe to Bot Events</strong> form.</p>

<p>That should work according to the documentation but it didn't in this case. so I started to wonder if that <strong><em>event</em></strong> isn't compatible with Dialogflow or if there was something missing in the documentation.</p>

<p><a href="https://i.stack.imgur.com/a7cvN.png" rel="noreferrer"><img src="https://i.stack.imgur.com/a7cvN.png" alt="SlackAPI Subscribe to Bot Events"></a></p>

<p>Please advise. Thanks!</p>
