Azure Function - Connect to MS Dynamics using application user - .NET core 3.1

prerequisite
1.Setup App registration in MS Azure and get Application (Client) Id and client secrets
2.Create Application user in MS Dynamics using application id from step 1.

Sample code snippet

using System;
using System.IO;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Extensions.Http;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
using Microsoft.PowerPlatform.Dataverse.Client;
using Microsoft.Xrm.Sdk.Query;
using Microsoft.Xrm.Sdk;

       [FunctionName("Function1")]
        public static async Task<IActionResult> Run(
            [HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req,
            ILogger log)
        {
            log.LogInformation("C# HTTP trigger function processed a request.");

            //Build the connection string
            var clientId = "";
            var clientSecret = "";
            var organizationUrl = "https://org.crm.dynamics.com/";

            string connectionString = "Url=" + organizationUrl + "; " +
                   "AuthType=ClientSecret; " +
                   "ClientId= " + clientId + "; " +
                   "ClientSecret=" + clientSecret + "; " +
                   "RequireNewInstance=false; " +
                   "SkipDiscovery=true";

            ServiceClient dataVerseConnection = new ServiceClient(connectionString);
            if (!dataVerseConnection.IsReady)
            {
                throw new Exception("Authentication Failed!");
            }
            
            string id = req.Query["Id"];
            string requestBody = await new StreamReader(req.Body).ReadToEndAsync();
            dynamic data = JsonConvert.DeserializeObject(requestBody);
            id = id ?? data?.Id;         

            string responseMessage = string.IsNullOrEmpty(id)
                ? "Pass an account id in the query string or in the request body for a personalized response."
                : $"Account Id, {id}. Account Name is "+ GetAccountName(dataVerseConnection, id);

            return new OkObjectResult(responseMessage);
        }

Read data from MS Dynamics 365

         public static string GetAccountName(ServiceClient dataVerseConnection,string accountId)
        {
            ColumnSet attributes = new ColumnSet(new string[] { "name" });            
            Entity accountEntity = dataVerseConnection.Retrieve("account", new Guid(accountId), attributes);
            string accountName = "";
            if(accountEntity !=null)
            {
                accountName = (accountEntity.Attributes.Contains("name")) ? accountEntity.GetAttributeValue<string>("name") : string.Empty;
            
            }
            return accountName;
        }