Why does HttpClient GetAsync() not return in Xamarin?

Question

I'm new to Xamarin and I'm trying to create a cross-platform app where users can login using a JSON API call. A token is then returned on a successful login attempt which I can use in other API's to display user data. It works when I use the same code in a console application, but when I run it in Xamarin the code after await client.GetAsync(url) is never reached and after a while the application breaks and I get an unknown error. Am I experiencing a deadlock?

  private async void loginButton_Click(object sender, EventArgs e)
    {
        var login = await loginAPI(LoginPage.nameEntry.Text, LoginPage.passEntry.Text);
        if (login.state == "success")
        {
            ...
        }
        else
        {
            ...
        }
    }
    public static async Task<LoginData> loginAPI(String username, String password)
    {
        try
        {
            using (var client = new HttpClient())
            {
                var loginUrl = new Uri("https://my-api/login?username=" + username + "&password=" + password);

                var result = await client.GetAsync(loginUrl);

                return JsonConvert.DeserializeObject<LoginData>(await result.Content.ReadAsStringAsync());

            }
        }
        catch (Exception e)
        {
            return null;
        }
    }
    public class LoginData
    {
        [JsonProperty("state")]
        public String state { get; set; }
        [JsonProperty("token")]
        public String token { get; set; }

    }