New-JobTrigger -AtStartup really doesnt work..?? :-(

Hi,

i tried this code, it works (at the first look) really good, the jobs are created and the job "WSUSUPdate" with trigger -at runs fantastic... but the job with the trigger, AtStartup works never.... can someone explain me why??

I tried to register ist local on myserver but this doesnt work too.. does anyone have any idea???

$computername = "myserver"
$cred = get-credential
Invoke-Command -ComputerName $computername -credential $cred -ScriptBlock {
$termin = New-JobTrigger –Once –At "June 03, 2016 11:35"
$start = New-JobTrigger -AtStartup
Register-ScheduledJob -Name WSUSUpdate -ScriptBlock { new-item -path "c:\wsus\jobfolder" -type directory -force} -Trigger ($Termin) -ScheduledJobOption (New-ScheduledJobOption -RunElevated)
Register-ScheduledJob -Name WSUSReboot -ScriptBlock { new-item -path "c:\wsus\jobfolder3" -type directory -force} -Trigger ($start) -ScheduledJobOption (New-ScheduledJobOption -RunElevated)
} 

And a scheduled-Task isnt working for me...