Unknown field error when trying to set Service desk id and request type Id when creating issue Edited

I am trying to use C sharp code to create request in service desk and set the reqeust type value for service desk request using REST API, but getting unknown field error when trying to create a request in JIRA Service desk.

Below is the actual code which has the meta data to set the request type.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace JiraConsoleApp
    class Program
        static void Main(string[] args)
            Jira objJira = new Jira();
            objJira.JiraUrl = "https://xxxx.atlassian.net";

            objJira.JiraJson = @"{""fields"":{
                ""project"": {""key"": ""xxxx""},
                ""issuetype"": {""name"": ""Incident""},
                ""serviceDeskId"": ""1"",
                ""requestTypeId"": ""1"",
                ""requestFieldValues"": {
                    ""summary"": ""This is an automated ticket for Testing"",
                    ""description"": ""Test - ignore this""

            objJira.JiraUserName = "xxxxx";
            objJira.JiraPassword = "jkl;UIOP&*()";

We utilize the output from the above code to be parsed to the main jira.cs file in the below code.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using MSXML2;

namespace JiraConsoleApp
    class Jira
        public string JiraUserName { get; set; }
        public string JiraPassword { get; set; }
        public string JiraUrl { get; set; }
        public string JiraJson { get; set; }

        private XMLHTTP60 JiraService = new XMLHTTP60();

        public String addJiraIssue()
            JiraService.open("POST", JiraUrl + "/rest/servicedeskapi/request/");
            JiraService.setRequestHeader("Content-Type", "application/json");
            JiraService.setRequestHeader("Accept", "application/json");
            JiraService.setRequestHeader("Authorization", "Basic " + GetEncodedCredentials());
            JiraService.setRequestHeader("X-Atlassian-Token", "no-check");
            String response = JiraService.responseText;
            return response;

        private string GetEncodedCredentials()
            string mergedCredentials = string.Format("{0}:{1}", JiraUserName, JiraPassword);
            byte[] byteCredentials = UTF8Encoding.UTF8.GetBytes(mergedCredentials);
            return Convert.ToBase64String(byteCredentials);


Tried the same using REST client using the below JSON data but able to create request and set the request type.

We are using the POST operation as shown below

Body of the request.
"serviceDeskId": "1",
"requestTypeId": "1",
"requestFieldValues": {
"summary": "Request JSD help via REST1",
"description": "I need a new mouse for my Mac"

Please let me know whats the mistake in the csharp code in setiing the service desk and reqeust type.

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