call Azure ARM REST API using user token via devicelogin

program.cs

using Microsoft.IdentityModel.Clients.ActiveDirectory;
using System;
using System.Net.Http;
using System.Threading.Tasks;

namespace ConsoleApp11
{
    class Program
    {
        static void Main(string[] args)
        {
            Task.Run(() => GetToken()).Wait();
        }

        private const string ARMClientID = "1950a258-227b-4e31-a9cf-717495945fc2"; // <- this is Azure PowerShell client id

        static async Task GetToken()
        {
            var authContextURL = "https://login.windows.net/common/";
            var authenticationContext = new AuthenticationContext(authContextURL);
            var deviceresult = await authenticationContext.AcquireDeviceCodeAsync("https://management.azure.com/", ARMClientID);
            Console.WriteLine(deviceresult.VerificationUrl);
            Console.WriteLine("device code: {0}", deviceresult.UserCode);
            var token  = await authenticationContext.AcquireTokenByDeviceCodeAsync(deviceresult);

            // call to Azure ARM REST API using user token

            var req = new HttpRequestMessage()
            {
                Method = HttpMethod.Get,
                RequestUri = new Uri("https://management.azure.com/providers/Microsoft.Features/operations?api-version=2015-12-01")
            };
            req.Headers.Add("Authorization", token.CreateAuthorizationHeader());
            var client = new HttpClient();
            var res = await client.SendAsync(req);

            Console.WriteLine("-----------------------");
            Console.WriteLine(res.StatusCode);
            var body = await res.Content.ReadAsStringAsync();
            Console.WriteLine(body);
        }
    }
}