title: None of your accounts are a member, code signing errors after upgrading to Xcode 8
body: <p>I'm trying to run some example projects from GitHub. After upgrading to Xcode 8, I see the same set of errors for multiple projects:</p>
  
  <ul>
  <li><code>None of your accounts are a member of '...': An unexpected error
  occurred. Xcode cannot find a team matching '...'.</code></li>
  <li><code>No profiles for '...' were found:  Xcode couldn't find a provisioning profile matching '...'.</code></li>
  <li><code>Code signing is required for product type 'Application' in SDK 'iOS 10.0'</code></li>
  </ul>
  
  <p><a href="https://i.stack.imgur.com/lncZg.png" rel="noreferrer"><img src="https://i.stack.imgur.com/lncZg.png" alt="enter image description here"></a></p>
  
  <p>I've tried the steps described here: <a href="https://stackoverflow.com/a/39498874/2901178">https://stackoverflow.com/a/39498874/2901178</a>, but it didn't work.</p>