Windows.Web.Http.HttpClient equivalent of UseDefaultCredentials

[bjorn-malmo]

Calling a web service using the System.Net.HttpClient(), setting the UseDefaultCredentials to true, as in:

        var handler = new HttpClientHandler();
        handler.UseDefaultCredentials = true;

        var client = new HttpClient(handler);
        var orderList = await client.GetAsync("https://example.com/getorders/");

will automatically negotiate the currently logged on Windows user's credentials with the server (if supported by the server of course). Everything "just works"! This will even work with the credentials negotiated using a VPN connection, which is great.

How would you accomplish the same feature using the more modern Windows.Web.Http.HttpClient()?
The response I get is a 401 Unauthorized with a header indicating WWW-Authenticate: Negotiate.

Is there a default handler that can handle the negotiation?
To be clear; this should be a single-sign-on request. I don't want to ask the user for username and password.

Regards Björn