D365 F&O delete TFS workspaces and re-assign to new developer

Easy way : 

1- Close Visual Studio

2- Open Run (Win+R) and paste one by one the following and delete anything inside:

    %localappdata%\Microsoft\Team Foundation\6.0\Cache\

    %localappdata%\Microsoft\VisualStudio

    %localappdata%\Microsoft\VSCommon

3- Restart your VM

4- Open visual studio and configure with new account

Painful way:

1- Close Visual Studio

2- Open Run (Win+R) and paste one by one the following and delete anything inside:

    %localappdata%\Microsoft\Team Foundation\6.0\Cache\

    %localappdata%\Microsoft\VisualStudio

    %localappdata%\Microsoft\VSCommon

3- Open command and run following commands:

• Goto IDE folder where the workspace program exist
  Cd C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\IDE
• Check all the current workspaces
  tf workspaces /server:https://dev.azure.com/{org} /computer:{ComputerName} /owner:* /format:detailed
• If you see any ghost workspace delete it
  tf workspace /delete /server:https://https://dev.azure.com/{org} '{WorkspaceName};{UserName}
  
  if above command give error run it with user id instead of username
  tf workspace /delete /server:https://https://dev.azure.com/{org} '{WorkspaceName};{UserId}

• Run this command to sure it's deleted
  tf workspaces /server:https://dev.azure.com/{org} /computer:{ComputerName} /owner:* /format:detailed

4- Restart your VM

5- Open visual studio and configure with new account