无法使用Microsoft Graph API C#代码获取部门名称、经理等

using Microsoft.Graph;
using Microsoft.Identity.Client;
using System;
using System.Collections.Generic;
using System.Threading.Tasks;

class Program
{
    static async Task Main(string[] args)
    {
        string clientId = "YourClientId";
        string clientSecret = "YourClientSecret";
        string tenantId = "YourTenantId";

        IConfidentialClientApplication confidentialClientApplication = ConfidentialClientApplicationBuilder
            .Create(clientId)
            .WithClientSecret(clientSecret)
            .WithAuthority($"https://login.microsoftonline.com/{tenantId}")
            .Build();

        string[] scopes = new string[] { "https://graph.microsoft.com/.default" };

        AuthenticationResult authenticationResult = await confidentialClientApplication
            .AcquireTokenForClient(scopes)
            .ExecuteAsync();

        GraphServiceClient graphServiceClient = new GraphServiceClient(
            new DelegateAuthenticationProvider(requestMessage =>
            {
                requestMessage.Headers.Authorization =
                    new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", authenticationResult.AccessToken);
                return Task.CompletedTask;
            }));

        string departmentId = "YourDepartmentId";
        User department = await graphServiceClient.Users[departmentId].Request().GetAsync();
        string departmentName = department.Department;
        string managerId = department.Manager.Id;
        User manager = await graphServiceClient.Users[managerId].Request().GetAsync();
        string managerName = manager.DisplayName;

        Console.WriteLine($"Department Name: {departmentName}");
        Console.WriteLine($"Manager Name: {managerName}");
    }
}