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I want to create a scheduled task using a gMSA account via powewershell but I get some errors when I try to register the task. Below you can see my code and the error:

$action = New-ScheduledTaskAction  "mypath\myscript.ps1"
$trigger = New-ScheduledTaskTrigger -Weekly -At 12:00 
$user =  New-ScheduledTaskPrincipal -UserId domain\gmsa -LogonType Password -RunLevel Highest
Register-ScheduledTask -TaskName "test" -Trigger $trigger -Action $action -User $user

This is the error:

 Register-ScheduledTask : The parameter is incorrect. At line:1 char:1
 + Register-ScheduledTask -TaskName "test" -Trigger $trigger -Action ...
 + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     + CategoryInfo          : InvalidArgument: (PS_ScheduledTask:Root/Microsof     t/...S_ScheduledTask)
 [Register-ScheduledTask], CimException
     + FullyQualifiedErrorId : HRESULT 0x80070057,Register-ScheduledTask
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4
  • I think this -User $user is meant to be <string> and you're passing an object as argument.
    – Santiago Squarzon
    Commented Jun 8, 2021 at 13:50
  • Try removing the Trigger, create the task without any trigger. I think the error could be related to it.
    – Santiago Squarzon
    Commented Jun 8, 2021 at 14:49
  • Hello, i hvae removed the trigger and the task was created, but i can not add manually the trigger becasues a passowrd is requested sice I use gmsa i don't know the password. Also i saw that the task doesn't work properly, it is on running state but nothing is happening. I think that the task trigger a notepad instead of .ps1 file
    – bogdan09
    Commented Jun 8, 2021 at 15:42
  • hello, i have created the task, i saved the script under "C" drive and when i run it from that path the thak was created. Thank you for you time!
    – bogdan09
    Commented Jun 9, 2021 at 13:19

1 Answer 1

Reset to default
2

Since you've already configured a logon principal for the task, use the -Principal parameter instead of -User:

Register-ScheduledTask -TaskName "test" -Trigger $trigger -Action $action -Principal $user
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3
  • i have changed the "-user" with "-principal " and i receive the same error
    – bogdan09
    Commented Jun 8, 2021 at 14:00
  • 1
    @bogdan09 Did you check if the gMSA is ready to be used on your current computer? Mathias answer is correct and should work just fine.
    – Santiago Squarzon
    Commented Jun 8, 2021 at 14:08
  • Hello, yes i checked , the output of this command "test-adserviceaccount mygmsa" is "true", also my server is member in that specified group and it si able to retreive the gmsa password
    – bogdan09
    Commented Jun 8, 2021 at 14:14

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