What causes context.GetServicesAsync().Result to return null?

I’m trying to get the demo program to Address Book with ASP.NET to run on my local PC. As far as I can tell I have followed all the setup instructions and can access the API using “API Docs” screen. When I run the .net app with debugging from visual studio, the LoginDemo() method works and reports successful login for my admin user. Next the DiscoveryDemo() method runs, but it fails to retrieve a services object (null result) using the call

IEnumerable services = context.GetServicesAsync().Result;

Then the method fails when it tries to enumerate the services object.

Am I missing a configuration setting somewhere within DreamFactory or the visual studio project? Thanks for the help.