我使用.net6进行身份验证并读取响应，但似乎什么都不起作用，我不知道我的身份验证是否正确，更不用说我的代码是否正确了
Azure中的所有配置都是根据文档完成的，我尝试了几种方法，但我不能成功，这是我最后一次尝试使它工作的代码

using System;
using System.Collections.Generic;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text.Json;
using System.Threading.Tasks;

namespace MicrosoftFormsExample
{
    class Program
    {
        static async Task Main(string[] args)
        {
            var responses = await GetFormResponses();
            PrintResponses(responses);
        }

        private static async Task<IList<FormResponse>> GetFormResponses()
        {
            var clientId = "<your-client-id>";
            var tenantId = "<your-tenant-id>";
            var clientSecret = "<your-client-secret>";
            var formId = "<form-id>";

            var token = await GetToken(clientId, tenantId, clientSecret);

            using var httpClient = new HttpClient();
            httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token);

            var response = await httpClient.GetAsync($"https://graph.microsoft.com/v1.0/forms/{formId}/responses");
            response.EnsureSuccessStatusCode();

            var content = await response.Content.ReadAsStringAsync();
            var options = new JsonSerializerOptions
            {
                PropertyNamingPolicy = JsonNamingPolicy.CamelCase
            };

            var formResponses = JsonSerializer.Deserialize<FormResponseCollection>(content, options).Value;
            return formResponses;
        }

        private static async Task<string> GetToken(string clientId, string tenantId, string clientSecret)
        {
            using var httpClient = new HttpClient();

            var content = new FormUrlEncodedContent(new Dictionary<string, string>
            {
                {"client_id", clientId},
                {"scope", "https://graph.microsoft.com/.default"},
                {"client_secret", clientSecret},
                {"grant_type", "client_credentials"}
            });

            var response = await httpClient.PostAsync($"https://login.microsoftonline.com/{tenantId}/oauth2/v2.0/token", content);
            response.EnsureSuccessStatusCode();

            var tokenResponse = await response.Content.ReadAsStringAsync();
            var token = JsonSerializer.Deserialize<TokenResponse>(tokenResponse).AccessToken;
            return token;
        }

        private static void PrintResponses(IList<FormResponse> responses)
        {
            foreach (var response in responses)
            {
                Console.WriteLine($"Response ID: {response.Id}");
                Console.WriteLine($"Submitted Date and Time: {response.SubmittedDateTime}");
                Console.WriteLine("Answers:");

                foreach (var question in response.Questions)
                {
                    Console.WriteLine($"  {question.QuestionText}: {question.ResponseText}");
                }

                Console.WriteLine();
            }
        }
    }

    class FormResponseCollection
    {
        public IList<FormResponse> Value { get; set; }
    }

    class FormResponse
    {
        public string Id { get; set; }
        public DateTimeOffset SubmittedDateTime { get; set; }
        public IList<QuestionResponse> Questions { get; set; }
    }

    class QuestionResponse
    {
        public string QuestionText { get; set; }
        public string ResponseText { get; set; }
    }

    class TokenResponse
    {
        public string AccessToken { get; set; }
    }
}

你能帮我吗？