Async method to make an http call using HttpClient never comes back

I have the following piece of code in a domain service:

HttpClient client = new HttpClient();
client.GetAsync("http://somewebsite.com").Result;

Which works fine, I can place a break point on followed lines and they do hit and all is good. However, I have the same line of code in a nuget package installed in this very same project. There there's the exact same http call:

public class Client : Base
{
    public Task<List<Stuff>> GetAsync()
    {
        return SendMessageAsync(HttpMethod.Get, "http://getstuff.com")
            .ContinueWith(x => JsonConvert.DeserializeObject<List<StuffView>>(x.Result.Content.ReasAsStringAsync().Result);
    }
}
public class Base
{
    HttpClient client:

    public Base(HttpClient client)
    {
        this.client = client:
    }
    protected async Task<HttpResponseMessage> GetMessageAsync(BttpMethod method, string url)
    {
        var request = CreateRequestAsync(method, url);
        request.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
        var response = await client.SendAsync(request); //line 1
        return response; // Line 2
    }
    protected HttpRequestMessage CreateRequestAsync(HttpMethod method, string url) 
    {
        var request = new HttpRequestMessage(method, url);
        request.SetBearerToken(myAccessTokenProvider);
        return request;
    }
}

This is how my domain service is using the nuget package code:

var client = factory.Create();
client.GetAsync().Result;

Debugging this code shows that inside Base class line 1 is hit but line 2 never does. Searching on internet it seems like a thread deadlock issue. So my question is, assuming it's a deadlock, why the heck the first http call in domain service works but not the second one that uses the nuget package code?!

HttpClient deadlock issue: HttpClient.GetAsync(...) never returns when using await/async