Powershell OnlyInJobError

Weird problem I saw today and I don't understand. Is there a difference beetween running a script manually in the ISE or Pshell, and as a job? If I run it manually the code doesn't throw an error - runs smoothly:

Get-ChildItem "\\SERVER\S$\ROOT\DIR" -Recurse | Where {$_.creationtime -lt (Get-Date).AddDays(-35)} | Remove-Item -Force -Include *.conf

But if I run it via Job and let the it export the $error to a txtfile this happens: Are the rights of my running machine different to the rights of the scheduled job?

Get-ChildItem : Zugriff verweigert
In Zeile:81 Zeichen:1
+ Get-ChildItem "\\SERVER\S$\ROOT\DIR" -Recurse | Where 
{$_.creati ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Get-ChildItem], UnauthorizedA 
   ccessException
    + FullyQualifiedErrorId : System.UnauthorizedAccessException,Microsoft.Pow 
   erShell.Commands.GetChildItemCommand

Zugriff verweigert = Access denied

Oh, totally forgot to tell about my windows rights. Normally the Server I am connecting to is blocked for everybody - except for login with credentials ofc. But somehow my manual powershell script is able to delete and create files? In "job-mode" it loses it's abilities.

Edit: Same for the Test-Path commandlet. Manually it shows me true or false. Via job it throws an error.

EDIT - SAME PROBLEM COMPLETELY DIFFERENT Commandlets:

$username = "Administrator"
$password = cat C:\securestring.txt | convertto-securestring
$cred = new-object -typename System.Management.Automation.PSCredential -argumentlist $username, $password

New-PSDrive -Name Z -PSProvider FileSystem -Root \\Server\ROOT -Credential $cred -Persist

test-path 'Z:'

Remove-PSDrive -Name Z -PSProvider FileSystem

This works!

This does not:

$jobname        = "Test5"
$JobTrigger     = New-JobTrigger -Daily -At "00:18 PM"
$MyOptions      = New-ScheduledJobOption -ContinueIfGoingOnBattery -HideInTaskScheduler -RunElevated
 Register-ScheduledJob -name "$jobname" -scriptblock  {


$username = "Administrator"
$password = cat C:\securestring.txt | convertto-securestring
$cred = new-object -typename System.Management.Automation.PSCredential -argumentlist $username, $password

New-PSDrive -Name Z -PSProvider FileSystem -Root \\Server\ROOT -Credential $cred -Persist

test-path 'Z:'

Remove-PSDrive -Name Z -PSProvider FileSystem

} -trigger $JobTrigger –ScheduledJobOption $MyOptions

Solution

Well, it is not exactly an answere to my original question, but I was able to work around my problem by using the invoke-command and test-path from there and giving argument via the -arg.

Invoke-Command -ComputerName $FTPADRESS -ArgumentList $DIRECTORY -ScriptBlock {param ($DIR)
                    $check = Test-Path -Path "\\SERVER\ROOT\$DIR"
                    if ($check -ne $true) {New-Item -ItemType directory -Path "\\SERVER\ROOT\$DIR"}
                                                                              }

Same works with the get-childitem.