title: Microsoft Teams messaging extension icons keep disappearing for a custom app
body: <p>We have developed messaging extension which we install by using &quot;Upload a custom app&quot; into different teams and channels in MS Teams. Couple a days after installing these messaging extensions, icons of these extensions start disappearing. Attached here is the screenshot -</p>
  <p><a href="https://i.stack.imgur.com/NLV8n.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/NLV8n.png" alt="enter image description here" /></a></p>
  <p>We have tried clearing cache, upload the icon in the Azure portal again, and redeploy the bot but nothing has worked so far. Any help as to why this happens and what is the solution would be appreciated.</p>