TF255050 TFS and Reports setup
Recently, whilst helping a customer upgrade to TFS 2013 we hit an issue configuring SQL Server Reports within the TFS Admin console.
In this particular dual tier configuration, SQL Reports was setup on a different server to the TFS databases. Here the solution was to ensure that the account that TFS was running under was a local admin on the SSRS machine whilst TFS Reports was configured. This can be removed once it's be setup.