Auth0 Device Flow - Console application .NET 7

Program.cs

using Newtonsoft.Json.Linq;
using RestSharp;

const string tenant = "dev-n1b7bzid.us";
const string clientId = "wnvXuZ1rD5VeT4NGBzr1MDNLWu43H5KA";
string access_token = string.Empty;

var client = new RestClient($"https://{tenant}.auth0.com/oauth/device/code");
var request = new RestRequest();
request.Method = Method.Post;
request.AddHeader("content-type", "application/x-www-form-urlencoded");
request.AddParameter("application/x-www-form-urlencoded", $"client_id={clientId}&scope=offline_access+openid+profile", ParameterType.RequestBody);
var response = client.Execute(request);

var json = JObject.Parse(response.Content);
var devicecode = json["device_code"].Value<string>();
var user_code = json["user_code"].Value<string>();
var verification_uri = json["verification_uri"].Value<string>();
var interval = json["interval"].Value<int>();
var expires = json["expires_in"].Value<int>();

Console.WriteLine($"Open a browser and paste the url: {verification_uri}, then insert the code: {user_code}");
Console.WriteLine("--------------------------------------------");

for (int i = 0; i < (expires / interval); i++)
{
    Task.Delay(interval * 1000).Wait();

    client = new RestClient($"https://{tenant}.auth0.com/oauth/token");
    request = new RestRequest();
    request.Method = Method.Post;
    request.AddHeader("content-type", "application/x-www-form-urlencoded");
    request.AddParameter("application/x-www-form-urlencoded", $"grant_type=urn:ietf:params:oauth:grant-type:device_code&device_code={devicecode}&client_id={clientId}", ParameterType.RequestBody);
    response = client.Execute(request);

    json = JObject.Parse(response.Content);

    if (response.IsSuccessStatusCode)
    {
        access_token = json["access_token"].Value<string>();
        Console.WriteLine($"Your token is: {access_token}");
        break;
    }
    else
    {
        var error = json["error"].Value<string>();
        var error_description = json["error_description"].Value<string>();
        Console.WriteLine($"Status: {error} - {error_description}");
    }
}

//Call your API with the token
client = new RestClient("https://fakerestapi.azurewebsites.net/api/v1/Activities");
request = new RestRequest();
request.Method= Method.Get;
request.AddHeader("content-type", "appliScation/json");
request.AddHeader("authorization", $"Bearer {access_token}");
response = client.Execute(request);

Console.WriteLine("--------------------------------------------");
Console.WriteLine("Response from API:");
Console.WriteLine(response.Content);