Node-SOAP Failed

index.ts

import * as soap from "soap";
var platformPassword = 'PlatformAPIPassword';
var platformUsername = 'PlatformAPIUser';
var url = "https://docs.mendix.com/apidocs-mxsdk/apidocs/attachments/9535497/19398865.wsdl";
var requestArgs: any = null;
var options: any = {};

requestArgs = {
    ApiKey: "667271d9-1b1b-4056-8c3e-4de044e9e57e",
    ProjectID: "b1bdb9f4-d92f-4a0c-a469-b163d874df31"
};

let soapHeader: any = {
    authentication:
        { username: platformUsername, password: platformPassword }
};
soap.createClient(url, options, function (err, soapClient) {
    var method = soapClient['StoriesAPI']['StoriesAPIPort']['GetSprints'];
    soapClient.addSoapHeader({
        'authentication':
            { 'username': platformUsername, 'password': platformPassword }
    }, "", "tns", "http://home.mendix.com/stories");
    soapClient.GetSprints(requestArgs, function (err: any, result: any, envelope: any, soapHeader: any) {
        console.log(JSON.stringify(result));
    });
});

Please resolve the issue. I want to access GetSprint Method from WSDL.