This is the code I use to send a key code

using System.IO.Ports;
using System;
using System.Threading;
using System.Collections;
using System.Runtime.InteropServices;
using System.Diagnostics;
using System.Windows.Forms;


namespace Arduino3
{
    internal static class Program { 

        //This is just a way to communicate with an Arduino
        static SerialPort _serialPort;
        [STAThread]
        static void Main()
        {
            _serialPort = new SerialPort();
            _serialPort.PortName = "COM5";//Set your board COM
            _serialPort.BaudRate = 9600;
            _serialPort.Open();
                 
            while (true)
            {
                string a = _serialPort.ReadExisting();
                Console.WriteLine(a);
                if(a == "test")
                {
                    SendKey();
                }
                Thread.Sleep(500);
            }
        }

        //This is one way I tried to send keys 
        private static void SendKey()
        {
            [DllImport("User32.dll")]
            static extern int SetForegroundWindow(IntPtr point);

            var p = Process.GetProcessesByName("Discord").LastOrDefault();
            var pointer = p.Handle;

            SetForegroundWindow(pointer);
            SendKeys.SendWait("F13");//F13,14,15,16
            SendKeys.Flush();

        }



        
    
    }
}

I can send keys like F13, F14, F15, F16, but F17 to F24 doesn't work.

And for keys D0-D9 I know nothing about and couldn't find much to answer my questions.

I tried using it like {F17},{D0} but it outputs an error saying "Keyword "D0" is not valid".

Microsoft docs

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