title: Cannot post activity. Unauthorized
body: <p>For some reason, I am unable to start even the simplest bot in Bot Framework Emulator.</p>
  <p>Steps to reproduce:</p>
  <ol>
  <li>In VS2019, create new Echo Bot (Bot Framework v4 - .NET Core 3.1) project (using Bot Framework v4 SDK Templates for Visual Studio)</li>
  <li>Run project without making any changes whatsoever (empty strings for <code>MicrosoftAppIdand</code> and <code>MicrosoftAppPasswordin</code> in <code>appsettings.json</code>)</li>
  <li>Start Bot Framework Emulator</li>
  </ol>
  <p><a href="https://i.stack.imgur.com/bnakm.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/bnakm.png" alt="enter image description here" /></a></p>
  <p><a href="https://i.stack.imgur.com/lPKy8.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/lPKy8.png" alt="enter image description here" /></a></p>
  <p><a href="https://i.stack.imgur.com/fn9cx.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/fn9cx.png" alt="enter image description here" /></a></p>
  <p>http://localhost:3978/ opens up in the browser without issue but in the Emulator I  get the below errors:</p>
  <p><code>Cannot post activity. Unauthorized.</code></p>
  <p><code>POST 401 directline/conversations/&lt;conversationId&gt;/activities</code></p>
  <p>What could be causing these errors with such a minimal project? My understanding is this should just work straight out of the box when running on localhost and no security credentials have been provided.</p>
  <p>I am using a work computer and I'm wondering if there is something 'behind the scenes' blocking a connection somewhere/somehow? I have no idea where to look, though. It works fine on another computer and was working fine on this machine when I last tried a couple of months ago so I'm really confused.</p>
  <p>Any clues or suggestions on how to debug this problem would be greatly appreciated.</p>