Microsoft Graph API 查询涉及 externalUserState C#

嗨，我正在尝试编写一个简单的控制台应用程序，我打算将其制作成批处理文件并获取通过电子邮件邀请的外部用户列表，现在他们在我们的 Azure 租户中拥有来宾帐户，并且他们已经兑换了是通过电子邮件发送给他们的。当他们赎回时，他们的extenalUserState设置为“已接受”。我想找到哪些具有该状态。

有人告诉我，我必须指向 API 的 beta 版本，而不是图形端点的 v.1.0。

我编写了以下基本代码，查看了可以在 API 等的 GitHub/MS 文档中找到的各种示例。

using Microsoft.Graph;
using Microsoft.IdentityModel.Clients.ActiveDirectory;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http.Headers;
using System.Text;
using System.Threading.Tasks;

namespace CreateAzureADUser
{
    class Program
    {
        static string TenantDomain;
        static string TenantId;
        static string ClientId;
        static string ClientSecret;
        static void Main(string[] args)
        {
            GetUsers();
            //Console.WriteLine("------------------------------------------\n\n");
            //GetGroupsAndMembers();
            //CreateAzureADUserNow();
        }

        private static void GetUsers()
        {
            var graphServiceClient = CreateGraphServiceClient();


            var users = graphServiceClient.Users.Request().Filter("userType eq 'Guest' and startswith(mail,'phs')")
                                                          .Select("id,mail,OnPremisesExtensionAttributes,userType,displayName,externalUserState")
                                                          .GetAsync()
                                                          .Result;



            Console.WriteLine("Users found: {0}", users.Count);
            Console.WriteLine();

            foreach (var item in users)
            {
                Console.WriteLine("displayName: {3} \nuser id: {0} \nuser email: {1} \nExtensionAttribute8: {2}\n", item.Id, item.Mail, item.OnPremisesExtensionAttributes.ExtensionAttribute8, item.DisplayName);
            }



        }

        public static GraphServiceClient CreateGraphServiceClient()
        {
            TenantDomain = "mycompanytenant.onmicrosoft.com";
            TenantId = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
            ClientId = "yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy";
            ClientSecret = "zzzzzzzzzzzz";

            var clientCredential = new ClientCredential(ClientId, ClientSecret);
            var authenticationContext = new AuthenticationContext($"https://login.microsoftonline.com/mycompanytenant.onmicrosoft.com");
            var authenticationResult = authenticationContext.AcquireTokenAsync("https://graph.microsoft.com", clientCredential).Result;


            var delegateAuthProvider = new DelegateAuthenticationProvider((requestMessage) =>
            {
                requestMessage.Headers.Authorization = new AuthenticationHeaderValue("bearer", authenticationResult.AccessToken);
                return Task.FromResult(0);
            });

            // Use this for v.1.0 endpoint
            //return new GraphServiceClient(delegateAuthProvider);

            // Use this for connecting to beta endpoint
            return new GraphServiceClient("https://graph.microsoft.com/beta", delegateAuthProvider);
        }
}
}

当我运行调试器时，我没有看到“ExternalUserState”作为返回用户的属性。

如何访问来宾用户对象上的 ExternalUserState 属性？