title: “TF14045: The identity <guid> is not a Recognized identity” with TFS 2012 update 4 after upgrade from 2010
body: <p>We recently migrated from TFS 2005 to TFS 2010 to TFS 2012 (Update 4)</p>
  
  <p>TFS 2005 to TFS 2010 was done through a upgrade process.  TFS 2010 to TFS 2012 was done through a detach (from TFS2010 box) and re-attach method (on TFS 2012 box)</p>
  
  <p>One of our users is getting the following error.  </p>
  
  <p>“TF14045: The identity  is not a Recognized identity” </p>
  
  <p>The problem seems to be related to his machine name &amp; workspace.</p>
  
  <p>When I try to search TFS workspaces by computer name using Team Foundation Sidekicks 2012, I get the same error.</p>
  
  <p>If the person works from a different pc, he doesn't have any issue.</p>
  
  <p>Here is some stuff that I've tried</p>
  
  <ul>
  <li>I tried deleting his profile and that didn't work.</li>
  <li>Tried installing vs2013 to see if it's a Visual studio 2010 issue and that didn't work    </li>
  <li>Reinstalled the pc but with the same name and I'm still getting the error.</li>
  <li>Tried to change the pc name, take it out of the domain, re-connect to the domain but that didn't work</li>
  </ul>
  
  <p>I haven't tried to rebuild the machine again but with a different name to see what happens. I just want to see if anyone has any suggestions before I redo that long task.</p>