钉钉注册回调接口失败

"errcode":71009,"errmsg":"返回文本非success， HTTP请求结果校验返回字段值失败 

        [HttpPost("dingtalk")]
        public JsonResult dingtalk([FromBody]DingDtos entitydto)
        {
        
            StringValues msgSignature = string.Empty;
            Request.Query.TryGetValue("signature", out msgSignature);
            StringValues timestamp = string.Empty;
            Request.Query.TryGetValue("timestamp", out timestamp);
            StringValues nonce = string.Empty;
            Request.Query.TryGetValue("nonce", out nonce);
            string encryptStr = entitydto.encrypt;
            string encrypt = string.Empty;
            string AesKey = "2e5mst3754bg5dv4639ahukj04dwmwzt4d6ps322jhr";//43位随机

            string Token = "123456";//加解密需要用到的token，普通企业可以随机填写
            string suiteKey = "dinga9XXXX";// 基本信息开发信息中

            string signatureNew = string.Empty;
            //DingTalkCrypt dingTalkCrypt = new DingTalkCrypt(Token, AesKey, suiteKey);
            DingTalkEncryptor dingTalkCrypt = new DingTalkEncryptor(Token, AesKey, suiteKey);
            //解密
            string EventType = dingTalkCrypt.getDecryptMsg(msgSignature, timestamp, nonce, encryptStr);
            Hashtable tb = (Hashtable)JsonConvert.DeserializeObject(EventType, typeof(Hashtable));
            string eventType = tb["EventType"].ToString();
            switch (eventType)
            {
                case "bpms_task_change"://审批任务开始，结束，转交
                    #region 审批任务开始，结束，转交

                    #endregion
                    break;
                case "bpms_instance_change"://审批实例开始，结束
                    #region 审批实例开始，结束
                    string processCode = tb["processCode"].ToString();

                  


                    #region 审批实例开始，结束

                
                    #endregion
                    #endregion
                    break;

            }

            //dingTalkCrypt = new DingTalkCrypt(Token, AesKey, suiteKey);

            #region 加密返回数据，必须要有，无需修改
            //加密
            //dingTalkCrypt.EncryptMsg("success", timestamp, nonce, ref encrypt, ref signatureNew);
            Dictionary<String, String> resultMap= dingTalkCrypt.getEncryptedMap("success",SysConvert.ToLong(timestamp));

            //查看解密结果是否是success
            string evne = dingTalkCrypt.getDecryptMsg(resultMap["msg_signature"], resultMap["timeStamp"], resultMap["nonce"], resultMap["encrypt"]);
            //dingTalkCrypt.DecryptMsg(signatureNew, timestamp, nonce, encrypt, ref evne);
            //SysFile.WriteFrameworkLog("查看解密结果是否是success：" + evne);
            DingDingBack back = new DingDingBack();
            back.msg_signature = resultMap["msg_signature"];
            back.encrypt = resultMap["encrypt"];
            back.timeStamp = resultMap["timeStamp"];
            back.nonce = resultMap["nonce"];
            //SysFile.WriteFrameworkLog("返回json：" + new JsonResult(back));
           
            return new JsonResult(back);
          
            #endregion

        }

特别注意：

    string suiteKey = "dinga9XXXX";// 基本信息开发信息中