C# – Visual Studio Online TF30063: You are not authorized to access

I am trying to connect to my Visual Studio Online account, via web api. Following the steps here for here:

http://blogs.msdn.com/b/buckh/archive/2013/01/07/how-to-connect-to-tf-service-without-a-prompt-for-liveid-credentials.aspx

NetworkCredential netCred = new NetworkCredential(
    "myaccount@gmail.com",
    "mypassword");
BasicAuthCredential basicCred = new BasicAuthCredential(netCred);
TfsClientCredentials tfsCred = new TfsClientCredentials(basicCred);
tfsCred.AllowInteractive = false;

TfsTeamProjectCollection tpc = new TfsTeamProjectCollection(
    new Uri("https://myaccount.visualstudio.com/DefaultCollection"),
    tfsCred);

tpc.EnsureAuthenticated();
Console.WriteLine(tpc.InstanceId);

However I get the following error message:

TF30063: You are not authorized to access .visualstudio.com