I get this every time I open Visual Studio 2013/2015 (premium):
TF400813: Resource not available for anonymous access. Client authentication required.
I can simply renter my credentials and everything works. But why do I have to do it every time?
Reauthenticating an account If there's a problem with your account, Visual Studio might ask you to re-enter your account credentials. Clicking on Re-enter your credentials will open your system's default web browser and attempt to automatically refresh your credentials.
If you have multiple Microsoft accounts and/or work or school accounts, you can add them all to Visual Studio so that you can access the resources from any account without having to sign in to it separately.
This problem occurs because the Visual Studio 2013 token cache is changing, and the cache is incompatible with the preview versions of Visual Studio 2013. To refresh the token, you have to reauthenticate. Check the link http://support.microsoft.com/kb/2892152 for more information.
The problem went away and I don't know why (Windows update?) I did not have the preview version installed at any point, so that was not the solution for me, although it probably is for others.
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