Azure AD：如何将成员添加到＆＃34;已启用邮件的安全组＆＃34;

Question

我正在尝试使用Graph API将用户添加到Azure AD组。

我可以创建和更新用户，但是当我尝试将用户添加到一个＆＃34;已启用邮件的安全组＆＃34;我收到这个错误：

  

System.Data.Services.Client.DataServiceClientException：

     

无法更新源自外部服务的对象的指定属性

{
"odata.error": {
        "code": "Request_BadRequest",
        "message": {
            "lang": "en",
            "value": "Unable to update the specified properties for objects that have originated within an external service."
        },
        "date": "2018-01-04T14:21:20",
        "requestId": "d6c76938-03d3-4668-8f69-2ed227f15063",
        "values": null
    }
}

我可以将用户添加到＆＃34; security＆＃34;或＆＃34; Office＆＃34;成员组，但无法将成员（用户）添加到＆＃34;已启用邮件的安全组＆＃34;。

我该如何解决这个问题？

这是我的代码：

 public async Task AddGroupMember(IUser newUser)
{
  try
  {
    var grpAlleBrukere = GetAlleBrukere();
    var upn = newUser.UserPrincipalName;
    var grpAlleBrukereId = GetAlleBrukere();
    IGroupFetcher groupFetcher = adClient.Groups.GetByObjectId(grpAlleBrukereId);
    Group group = (Group)groupFetcher.ExecuteAsync().Result;

    if (group.ObjectId != null)
    {
      IUser user = adClient.Users.Where(u => u.UserPrincipalName.Equals(upn, StringComparison.CurrentCultureIgnoreCase)).ExecuteAsync().Result.CurrentPage.ToArray().First();
      if (user != null)
      {
        //check wather user aleady present into group or not
        IDirectoryObject userExists = group.Members.Where(u => u.ObjectId == user.ObjectId).FirstOrDefault();
        if (userExists == null)
        {
          group.Members.Add(user as DirectoryObject);
          group.UpdateAsync().Wait();
        }
      }
      else
        throw new Exception("User is null.");
    }       
  }
  catch(Exception ex)
  {
    Console.WriteLine("ERROR: " + ex.Message);
    Console.WriteLine("ERROR: " + ex.Source);
    Console.WriteLine("ERROR: " + ex.StackTrace);
    Console.WriteLine("ERROR: " + ex.InnerException);
  }
}