Resolving error "TF31001: Cannot connect to Team Foundation Server at .visualstudio.com. The server returned the following error: Key not valid for use in specified state."

Due to a Visual Studio 2013 client bug if you change your Windows credentials you might lose access to your Team Foundation Service accounts and receive the following error message:

"TF31001: Cannot connect to Team Foundation Server at .visualstudio.com. The server returned the following error: Key not valid for use in specified state."

FIX:
1. Close all instances of Visual Studio 2013
2. Delete this folder in the registry (just “TokenStorage” – nothing else):

HKEY_CURRENT_USER\Software\Microsoft\VSCommon\12.0\ClientServices\TokenStorage

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