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force.com returns no AuthenticationClient values

First attempt at using Force.com Toolkit.
Hard coded in parameter values to implement UsernamePasswordAsync (for testing)
var auth = new AuthenticationClient();

auth.UsernamePasswordAsync(string clientid, string clientsecret, string username, string password)

auth.id : no value
auth.InstanceUrl : no value
auth.AccessToken : no value
auth.ApiVersion : v36.0

I have checked Permission Sets and it is ok.
What am I missing?