C# Google使用服务帐户联系API

我在使用google api v3在google中创建联系人时遇到问题。 我可以成功调用

cr.GetContacts（）

获取所有联系人（针对我指定的用户），但是

cr.Insert

给了我一个错误：

执行请求失败：

我错过什么了吗

    string serviceAccountEmail = "111111111111-aaaa1a1aa11a1aaaaaaa11aaaa1aaa11@developer.gserviceaccount.com";
    X509Certificate2 certificate = new X509Certificate2(@"C:\All\ContactsManager-1aa1bbb1ab11.p12", "notasecret", X509KeyStorageFlags.Exportable);

    ServiceAccountCredential credential = new ServiceAccountCredential(new ServiceAccountCredential.Initializer(serviceAccountEmail)
    {
        Scopes = new[]
            {
                "https://www.google.com/m8/feeds"
            },
        User = "someuser@mydomain.com"
    }.FromCertificate(certificate));

    credential.RequestAccessTokenAsync(System.Threading.CancellationToken.None).Wait();

    RequestSettings rs = new RequestSettings("ContactsManager", credential.Token.AccessToken);
    //rs.AutoPaging = true;

    ContactsRequest cr = new ContactsRequest(rs);
    //var contacts = cr.GetContacts();  //////THIS LINE WORKS AND GETS ALL THE CONTACTS

    Uri feedUri = new Uri(ContactsQuery.CreateContactsUri("someuser@mydomain.com"));
    //feedUri will now be    https://www.google.com/m8/feeds/contacts/someuser%40mydomain.com/full

    Contact createdEntry = cr.Insert(feedUri, newContact);

    Console.WriteLine("Contact's ID: " + createdEntry.Id);

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编辑：我解决了问题，只想为其他有同样问题的人更新。 如果您遵循创建联系人的步骤：他们在该联系人实体上有如下部分：

newEntry.IMs.Add(new IMAddress()
  {
    Primary = true,
    Rel = ContactsRelationships.IsHome,
    Protocol = ContactsProtocols.IsGoogleTalk,
  });

---

如果您删除此IMAddress，则联系人将正常创建。

您是否授予服务帐户写访问权限？