我有这个json数据要解析，但我得到了解析错误，一些可以解释一些吗？

这是我希望在收到时解析的Json数据:

{
      "id": "/subscriptions/xxxx",
      "type": "Microsoft.ApiManagement/service/users",
      "name": "bbbbb",
      "properties": {
        "firstName": "aaaa",
        "lastName": "cccc",
        "email": "someone@somewhere.xyz",
        "state": "active",
        "registrationDate": "somedate",
        "note": null,
        "groups": [],
        "identities": [
          {
            "provider": "Basic",
            "id": "someone@somewhere.xyz"
          }
        ]
      }
    }

这些是我创建的类，用于将数据反序列化为:

 public class NewUserAPIMResultingData
        {
            [JsonProperty("id")]
            public string id { get; set; }
            [JsonProperty("type")]
            public string thisType { get; set; }
            [JsonProperty("name")]
            public string name { get; set; }
            [JsonProperty("properties")]
            public NewUserAPIMResultingDataProperties properties { get; set; }
        }
        public class NewUserAPIMResultingDataProperties
        {
            [JsonProperty("firstName")]
            public string userFirstName { get; set; }
            [JsonProperty("lastName")]
            public string userLastName { get; set; }
            [JsonProperty("email")]
            public string userEmail { get; set; }
            [JsonProperty("state")]
            public string state { get; set; }
            [JsonProperty("registrationDate")]
            public string registrationDate { get; set; }
            [JsonProperty("note")]
            public string note { get; set; }
            [JsonProperty("groups")]
            public IEnumerable<string> groups { get; set; }
            [JsonProperty("identities")]
            public IEnumerable<NewUserAPIMResultingDataPropertyIdentity> identities { get; set; }
        }
        public class NewUserAPIMResultingDataPropertyIdentity
        {
            [JsonProperty("provider")]
            public string provider { get; set; }
            [JsonProperty("id")]
            public string id { get; set; }
        }

这是我用来读取接收和解析的json数据的。NET C#代码:

var formCreateUserContent=新的StringContent（json，encoding.utf8，“application/json”）； var newUserResult=新的NewUserAPIMResultingData（）；

            using (HttpClient client2 = new HttpClient())
            {
                using (HttpResponseMessage response = await client2.PutAsync(url, formCreateUserContent))
                {
                    using (HttpContent content = response.Content)
                    {
                        var stringContent = await content.ReadAsStringAsync();
                        newUserResult = JsonConvert.DeserializeObject<NewUserAPIMResultingData>(stringContent);
                    }
                    foreach (var z in newUserResult.properties.identities)
                        Console.WriteLine(z);
                }
            }

这是我在控制台上得到的错误:[09/06/2020 13:34:13]Executed'TestCreateAPImuser'[09/06/2020 13:34:13]System.Private.Corelib:执行函数时异常:TestCreateAPImuser。 newtonSoft.json:解析值时遇到意外字符:{。Path“properties.groups”，第13行，位置7。