救火 获取永久授权码时errcode60020errmsg访问ip不在白名单之中

                          //获取永久的授权码
                string surl = "https://oapi.dingtalk.com/service/get_permanent_code?suite_access_token=" + suite_access_token;
                string param = "{\"tmp_auth_code\":\"" + tmp_auth_code + "\"}";
                string permanentcodestr = HttpHelper.Post(surl, param);
                Helper.WriteLog("企业的永久授权码：" + permanentcodestr);


                             返回
                              企业的永久授权码：{"errcode":60020,"errmsg":"访问ip不在白名单之中"}


                              这是什么原因？其它地方调用接口并没有这个错误。


谢谢