C# Generate token console for Intune datawarehouse

Using .NET 4.8.1 and the code snippet below from Microsoft Learn (https://video2.skills-academy.com/en-us/mem/intune/developer/data-warehouse-app-only-auth-). I am unable to get this module to work.

It seems the line with AuthenticationContext, ClientCredential and SecureClientSecret are outdated/depreciated. Example - error: ClientCredential' is obsolete: 'Use ConfidentialClientApplicationBuilder.WithCertificate or WithClientSecret instead. I cannot get this code snippet to work.

Can anyone help refine this?

Here's the complete class:

using System.Security;
using System.Configuration;
using Microsoft.Identity.Client;


class IntuneDataWarehouse
{
    public static void Main()
    {
        Console.WriteLine("Intune Datawarehouse Start");

        var applicationId = ConfigurationManager.AppSettings["appId"].ToString();
        SecureString applicationSecret = ConvertToSecureStr(ConfigurationManager.AppSettings["appKey"].ToString()); // Load as SecureString from configuration file or secret store (i.e. Azure KeyVault)
        var tenantDomain = ConfigurationManager.AppSettings["tenantDomain"].ToString();

        var msalContext = new AuthenticationContext($"https://login.windows.net/" + tenantDomain + "/oauth2/token");

         AuthenticationResult authResult = msalContext.AcquireTokenAsync(
         resource: "https://api.manage.microsoft.com/",
         clientCredential: new ClientCredential(
             applicationId,
             new SecureClientSecret(applicationSecret))).Result;

        Console.WriteLine("End of run");
    }

    private static SecureString ConvertToSecureStr(string appkey)
    {
        if (appkey == null)
            throw new ArgumentNullException("AppKey must not be null.");

        var secureAppKey = new SecureString();

        foreach (char c in appkey)
            secureAppKey.AppendChar(c);

        secureAppKey.MakeReadOnly();
        return secureAppKey;
    }
}