谷歌电子邮件设置api作为别名发送

Question

尝试使用C＃的电子邮件设置API创建sendas别名时出错。这是我的代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Google.GData.Apps;
using Google.GData.Apps.GoogleMailSettings;
using Google.GData.Client;
using Google.GData.Extensions;


namespace EmailSettings
{
    class Program
    {
        static void Main(string[] args)
        {
            GoogleMailSettingsService service = new GoogleMailSettingsService("domain.com", "apps");
            service.setUserCredentials("administrator@domain.com", "pwd");

            service.CreateSendAs("username", "FriendlyAlias", "testalias@domain.com", "", "true");
        }
    }
}

我收到以下错误＆＃34; {＆＃34;执行请求失败：https://apps-apis.google.com/a/feeds/emailsettings/2.0/domain.com/username/sendas＆＃34;}＆＃34;

内部异常是{＆＃34;远程服务器返回错误：（400）错误请求。＆＃34;}