Why this VIES check is not working anymore?

Why this code is not working anymore? Is something changed in the Vies on-the-Web recently? https://ec.europa.eu/taxation_customs/vies/#/technical-information

if (CommonUtils.IsAvailable("http://ec.europa.eu/taxation_customs/vies/services/checkVatService", 1000))
{
    try
    {
        checkVatPortType test = new checkVatPortTypeClient("checkVatPort", "http://ec.europa.eu/taxation_customs/vies/services/checkVatService");
        checkVatResponse response = await test.checkVatAsync(new checkVatRequest(new checkVatRequestBody() {countryCode = countryCode, vatNumber = vatNumber}));