Powershell run job at startup with admin rights using ScheduledJob

This is code that is already in production that I use. If it does not work for you, you must have something else going on with your system.

function Invoke-PrepareScheduledTask{    $taskName = "UCM_MSSQL"    $task = Get-ScheduledTask -TaskName $taskName -ErrorAction SilentlyContinue    if ($task -ne $null)    {        Unregister-ScheduledTask -TaskName $taskName -Confirm:$false     }    # TODO: EDIT THIS STUFF AS NEEDED...    $action = New-ScheduledTaskAction -Execute 'powershell.exe' -Argument '-File "C:\Invoke-MYSCRIPT.ps1"'    $trigger = New-ScheduledTaskTrigger -AtStartup -RandomDelay 00:00:30    $settings = New-ScheduledTaskSettingsSet -Compatibility Win8    $principal = New-ScheduledTaskPrincipal -UserId SYSTEM -LogonType ServiceAccount -RunLevel Highest    $definition = New-ScheduledTask -Action $action -Principal $principal -Trigger $trigger -Settings $settings -Description "Run $($taskName) at startup"    Register-ScheduledTask -TaskName $taskName -InputObject $definition    $task = Get-ScheduledTask -TaskName $taskName -ErrorAction SilentlyContinue    # TODO: LOG AS NEEDED...    if ($task -ne $null)    {        Write-Output "Created scheduled task: '$($task.ToString())'."    }    else    {        Write-Output "Created scheduled task: FAILED."    }}

If it works, it's not a script problem. Assign it to the SYSTEM account or make a separate service account instead of the Gagan account shown. Make sure that service account has "Permission to run as batch job" in your local security policy.

Please check the checkbox for "Run with highest privileges" for the task in the task scheduler and try again. Currently in the screenshot above it is unchecked.

I have circled it below in red for your easy reference: