I'm running the tfs upgrade wizard (from RC to RTM). On reaching the Readiness Checks I'm getting an error on the 'Configuration Database' :
[ Configuration Database ] TF255440: The following account has a SQL Server login, but the login was denied access: DOMAIN\User. The server selected to host the databases for Team Foundation Server is: MYSERVER. The SQL Server login associated with the user account must be granted access to the SQL Server instance on that server.
I've tried changing user mappings and roles but so far no joy.