Create access token from c sharp code and get it in dynamics 365 FO

C#

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Net.Http;

namespace AY_AccessToken

{

    public class ClassAccessToken

    {

        private static string clientId = "2539b54-0891-4aad-99a6";

        private static string clientSecret = "H18Q~DntOA9aQX";

        private static string resource = "https://10devadevaos.axcloud.dynamics.com";

        private static HttpClient httpClient = new HttpClient();

        public static string GetAccessToken()

        {

            var content = new StringContent($"grant_type=client_credentials&client_id={clientId}&client_secret={clientSecret}&resource={resource}");

            content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/x-www-form-urlencoded");

            var response = httpClient.PostAsync("https://login.microsoftonline.com/bacbd475-b9da-43fa/oauth2/token", content).GetAwaiter().GetResult();

            var result = response.Content.ReadAsStringAsync().GetAwaiter().GetResult();

            string accessToken = result.Split(':')[1].Split(',')[0].Replace("\"", "");

            string search = "\"access_token\":\"";

            int start = result.IndexOf(search) + search.Length;

            int end = result.IndexOf("\"", start);

            string accessTokenFinal = result.Substring(start, end - start);

            return accessTokenFinal;

        }

    }

}

Dynamics 365 F&O code to get the token:

using AY_AccessToken;

internal final class RunnableClass1

{

    public static void main(Args _args)

    {

        str accessToken;

        accessToken = ClassAccessToken::GetAccessToken();

        info(accessToken);

    }

}