ServerManager.GetAdministrationConfiguration is empty on IIS 7.5

I want to manage IIS (versions 7-10) by using C# ServerManager сlass.

Locally GetAdministrationConfiguration method returns 1 section group and 2 sections in administration config (see code below).

But on remote server there are 0 section groups and 0 sections.

Source code (need to add Microsoft.Web.Administration in "Extensions" references of C# project):

using Microsoft.Web.Administration;
using System;

namespace ConsoleApp7
{
    class Program
    {
        static void Main(string[] args)
        {
            using (var iisManager = new ServerManager())
            {
                var c = iisManager.GetAdministrationConfiguration();

                Console.WriteLine(c.RootSectionGroup.SectionGroups.Count);
                Console.WriteLine(c.RootSectionGroup.Sections.Count);
            }
            Console.ReadKey();
        }
    }
}

• Local machine: Win10, IIS 10.0, .NET framework 4.7.1.
• Remote server #1: Win2008R2, IIS 7.5, .NET framework 4.7.2.
• Remote server #2: Win7, IIS 7.5, .NET framework 4.5.2.

On all machines C:\Windows\System32\inetsrv\Config\administration.config is avaliable and contains all needed sections.

How to get administration configuration of IIS on remote servers?