IAutomaticUpdates2::EnableService returns Access is denied even when run as administrator

Question

I'm using the COM interface to access the Windows Update API. I get access denied when i call IAutomaticUpdates2::EnableService even though i am running as admin.

Code

   fn enabled_windows_update() {  
       unsafe {  
           Com::CoInitialize(None).unwrap();  
       }  
     
       let gid = windows::core::GUID::from("BFE18E9C-6D87-4450-B37C-E02F0B373803");  
     
       let mut handle: windows::Win32::System::UpdateAgent::IAutomaticUpdates2 =  
           unsafe { Com::CoCreateInstance(&gid as *const _, None, Com::CLSCTX_ALL).unwrap() };  
     
       println!("{:?}", unsafe { handle.EnableService() });  
   }  

Answer 1

You can use Service Configuration Programs and Service Control Programs to modify or query the database of installed services and starts and controls services respectively.
There is a Complete Service Sample.

Answer 2

I tested in C++ on Windows 10 21H1 : I also get E_ACCESSDENIED,
but if I check the "Windows Update" service in services.msc, it becomes enabled (Manual) ...