Rate returns nothing when creating multi-pieces parcel

There is no rate return when creating multi-pieces parcel. Here is an example provided from its document.
        APIResource resource = new APIResource(token);

        Hashtable toAddressTable = new Hashtable();
        toAddressTable.Add("name", "Mr. Hippo");
        toAddressTable.Add("company", "Shippo");
        toAddressTable.Add("street1", "215 Clayton St.");
        toAddressTable.Add("city", "San Francisco");
        toAddressTable.Add("state", "CA");
        toAddressTable.Add("zip", "94117");
        toAddressTable.Add("country", "US");
        toAddressTable.Add("phone", "+1 555 341 9393");
        toAddressTable.Add("email", "support@goshipppo.com");

        Hashtable fromAddressTable = new Hashtable();
        fromAddressTable.Add("name", "Ms Hippo");
        fromAddressTable.Add("company", "San Diego Zoo");
        fromAddressTable.Add("street1", "2920 Zoo Drive");
        fromAddressTable.Add("city", "San Diego");
        fromAddressTable.Add("state", "CA");
        fromAddressTable.Add("zip", "92101");
        fromAddressTable.Add("country", "US");
        fromAddressTable.Add("email", "hippo@goshipppo.com");
        fromAddressTable.Add("phone", "+1 619 231 1515");
        fromAddressTable.Add("metadata", "Customer ID 123456");

        List<Hashtable> parcelsList = new List<Hashtable>();

        Hashtable parcelTable = new Hashtable();
        parcelTable.Add("length", "5");
        parcelTable.Add("width", "5");
        parcelTable.Add("height", "5");
        parcelTable.Add("distance_unit", "in");
        parcelTable.Add("weight", "2");
        parcelTable.Add("mass_unit", "lb");

        Hashtable parcelTableTwo = new Hashtable();
        parcelTableTwo.Add("length", "1");
        parcelTableTwo.Add("width", "1");
        parcelTableTwo.Add("height", "1");
        parcelTableTwo.Add("distance_unit", "in");
        parcelTableTwo.Add("weight", "2");
        parcelTableTwo.Add("mass_unit", "lb");

        parcelsList.Add(parcelTable);
        parcelsList.Add(parcelTableTwo);

        Hashtable shipmentTable = new Hashtable();
        shipmentTable.Add("address_to", toAddressTable);
        shipmentTable.Add("address_from", fromAddressTable);
        shipmentTable.Add("parcels", parcelsList);
        shipmentTable.Add("async", false);

       Shipment shipment = resource.CreateShipment(shipmentTable);

       Response.Write(shipment.Rates.Count().ToString()); // **output 0**
goshippo / shippo-csharp-client

Rate returns nothing when creating multi-pieces parcel #48
