title: Microsoft Teams + Azure Bot: Intermittent Error 403 "The bot is not part of the conversation roster"
body: <p>I'm debugging the issue with my microsoft bot, registered in Azure, and MS Teams. It is intermittent issue. The thing is that sometimes I'm getting this error message when my bot is trying to notify MS Teams:</p>
  
  <pre><code>{
      "error":{
          "code":"BotNotInConversationRoster",
          "message":"The bot is not part of the conversation roster."
      }
  }
  </code></pre>
  
  <p>No luck with googling it or searching it in microsoft docs. Also, no errors or warnings in Azure bot activity log.</p>
  
  <p>In Azure in Home -> My Bot -> Channels -> MS Teams -> Warnings, I see this, but it doesn't really help:</p>
  
  <pre><code>7/22/2019, 3:41:37 PM   The bot is not part of the conversation roster.
  7/22/2019, 11:24:45 AM  The bot is not part of the conversation roster.
  7/19/2019, 1:04:26 PM   The bot is not part of the conversation roster.
  7/19/2019, 12:08:34 PM  The bot is not part of the conversation roster.
  7/19/2019, 12:04:50 PM  The bot is not part of the conversation roster.
  7/19/2019, 11:37:56 AM  The bot is not part of the conversation roster.
  7/19/2019, 11:23:21 AM  The bot is not part of the conversation roster.
  7/19/2019, 11:15:17 AM  The bot is not part of the conversation roster.
  7/16/2019, 12:21:42 PM  Unknown
  </code></pre>
  
  <p>Has anybody encountered this issue? What can it be? How can I fix it?</p>
  
  <p>Any help is really appreciated, thanks!</p>