Error code 404 and CMN-102 even if the subscription exists.

Following is our subscription id - 0a84e146-ca2b-4577-9d49-e784a8cdc1e3. When we try to renew it from our code, it throws a 404 error. We are able to renew it from the API reference page.

Following is our code.

try

            {

                using (RestClient rc = new RestClient("tOwXT1UcSMOKodEO6-PCFw"

                                                    , RINGCENTRAL_CLIENTSECRET

                                                    , true))

                {

                    TokenInfo token = await rc.Authorize("+16822823056"

                                                        , RINGCENTRAL_EXTENSION

                                                        , RINGCENTRAL_PASSWORD);



                    if (rc.token.access_token.Length > 0)

                    {

                        subscriptionInfo 

                            = await rc.Restapi()

                                .Subscription("0a84e146-ca2b-4577-9d49-e784a8cdc1e3")

                                .Renew()

                                .Post();

                    }

                }

            }

            catch (FlurlHttpException fhEx)

            {

                ins_error_log log = new ins_error_log();

                log.runSP(fhEx, false);

            }

            catch (ObjectDisposedException odEx)

            {

                ins_error_log log = new ins_error_log();

                log.runSP(odEx, false);

            }

            catch (Exception ex)

            {

                ins_error_log log = new ins_error_log();

                log.runSP(ex, false);

            }