Connect Remote Task scheduler using c# throws error

An unhandled exception of type 'System.Runtime.InteropServices.COMException' occurred in Microsoft.Win32.TaskScheduler.dll

Additional information:

The request is not supported. (Exception from HRESULT: 0x80070032)

My Code:

using (TaskService tasksrvc = new TaskService(@"\\hqbusa1057", "muthuusername", "igatate", "pwd"))
{
    Task task = tasksrvc.FindTask("POC", true); task.Run();
}

I had the same issue caused by the firewall on the requested computer.

Allow 'Remote Scheduled Task Management' in your Windows Firewall to prevent the error when a new TaskService is created.

Also, allowing 'Remote Event Log Management' may be helpful if you want to access task logs (history).