create database in microsoft azure from code c #

I'm trying to create a database with a program written in c #. I created a free account and created a resource of azure cosmos db. The connection to the cosmos account db is done correctly but at the time of creating the database I do not get an answer, it stays and waits. Is it possible that I need a larger subscription to do this? The code is as follows:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net;
using Microsoft.Azure.Documents;
using Microsoft.Azure.Documents.Client;
using Newtonsoft.Json;

namespace AzureApp
{
  class Program
  {
    private const string EndpointUrl = "<endpoint>";
    private const string PrimaryKey = "<privatekey>";
    private DocumentClient client;

    static void Main(string[] args)
    {
        try
        {
            Program p = new Program();
            p.GetStartedDemo().Wait();
        }
        catch (DocumentClientException de)
        {
            Exception baseException = de.GetBaseException();
            Console.WriteLine("{0} error occurred: {1}, Message: {2}", de.StatusCode, de.Message, baseException.Message);
        }
        catch (Exception e)
        {
            Exception baseException = e.GetBaseException();
            Console.WriteLine("Error: {0}, Message: {1}", e.Message, baseException.Message);
        }
        finally
        {
            Console.WriteLine("End of demo, press any key to exit.");
            Console.ReadKey();
        }
    }

    private async Task GetStartedDemo()
    {
        this.client = new DocumentClient(new Uri(EndpointUrl), PrimaryKey);

        await this.client.CreateDatabaseIfNotExistsAsync(new Database { Id = "FamilyDB" });
    }

    private void WriteToConsoleAndPromptToContinue(string format, params object[] args)
    {
        Console.WriteLine(format, args);
        Console.WriteLine("Press any key to continue ...");
        Console.ReadKey();
    }
  }
}

Thanks in advance.