Getting System.ComponentModel.Win32Exception (5): Access is denied on Azure-Release

I am running UI-Automation Test with Appium WinAppDriver using a .bat file. When I run the .bat file manually on the agent everything goes as expected but it produces System.ComponentModel.Win32Exception (5): Access is denied exception when running through Azure Release.

Tried: BuildUser is the account having admin privileges on my agent machine DOTNET4. I have tried running the release pipeline using both BuildUser account and also my local account.

Tried different ways to run the .bat file as admin too.

I provided Full Control of folder in which I have WinAppDriver.exe, AzureAgent.exe, & Folder having AUT.

Azure Agent Service in running using the BuildUser account in Windows Services. I have this .exe running using Run as Administrator.

Contents of .bat file is attached:

@echo off
set TESTDIR=%~1
set LaunchedFromWinAppDriver=True
set ApplicationExe=C:\Git\filePathToExe\application.exe
C:\Git\filePathToExe\AppExeCommandLineRunner.exe -X "%ApplicationExe%"::"%TESTDIR%"

Code Snippet that is causing Exception:

public static void KillApplication()
        {
            try
            {
                string windowHandle = WindowDriver.CurrentWindowHandle;
                Log.Debug("CurrentWindowHandl:"+windowHandle);
                [DllImport("user32.dll")]
                static extern uint GetWindowThreadProcessId(IntPtr hWnd, out uint processId);
                IntPtr windowHandlePtr = new IntPtr(Convert.ToInt64(windowHandle, 16));
                Log.Debug("WindowHandlePtr:" +windowHandlePtr.ToString());
                uint processId;
                GetWindowThreadProcessId(windowHandlePtr, out processId);
                Log.Debug("Process Id for killing is: " + (int)processId);
                Process process = Process.GetProcessById((int)processId);
                process.Kill();
            }
            catch(Exception ex)
            {
                Log.Error("FailedToKill:", ex);
                throw;
            }
        }

Function GetWindowThreadProcessId returns 0 when run using Azure Release pipeline and then process.Kill generates the exception.process. Additionally if I give a valid Process id using some other logic it fails to Kill that as well giving same access id denied.

GetWindowThreadProcessId returns a valid process id on which AUT is attached when the .bat file is run manually on the agent.

I believe this issue is due to a permission issue.