ProcessStartInfo i Process w PowerShell - Błąd uwierzytelniania

Mam kod, który używa ProcessStartInfo i Process do wywołania innego skryptu i do zwrócenia danych wyjściowych tego skryptu.

Niestety otrzymuję błędy i nie mam pewności, jak je rozwiązać.

#script1.ps1

$abc = $args
$startInfo = $NULL
$process = $NULL
$standardOut = $NULL

<#Previously created password file in C:\Script\cred.txt, read-host -assecurestring | convertfrom-securestring | out-file C:\Script\cred.txt#>
$password = get-content C:\Script\cred.txt | convertto-securestring


$startInfo = New-Object System.Diagnostics.ProcessStartInfo
$startInfo.FileName = "powershell.exe"
$startInfo.Arguments = "C:\script\script2.ps1", $abc

$startInfo.RedirectStandardOutput = $true
$startInfo.UseShellExecute = $false
$startInfo.CreateNoWindow = $false
$startInfo.Username = "DOMAIN\Username"
$startInfo.Password = $password

$process = New-Object System.Diagnostics.Process
$process.StartInfo = $startInfo
$process.Start() | Out-Null
$standardOut = $process.StandardOutput.ReadToEnd()
$process.WaitForExit()

# $standardOut should contain the results of "C:\script\script2.ps1"
$standardOut

Błędy, które otrzymuję, to:

Exception calling "Start" with "0" argument(s): "Logon failure: unknown user name or bad password"
At C:\script\script1.ps1:46 char:15
+ $process.Start <<<< () | Out-Null
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : DotNetMethodException

You cannot call a method on a null-valued expression.
At C:\script\script1.ps1:47 char:49
+ $standardOut = $process.StandardOutput.ReadToEnd <<<< ()
    + CategoryInfo          : InvalidOperation: (ReadToEnd:String) [], RuntimeException
    + FullyQualifiedErrorId : InvokeMethodOnNull

Exception calling "WaitForExit" with "0" argument(s): "No process is associated with this object."
At C:\script\script1.ps1:48 char:21
+ $process.WaitForExit <<<< ()
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : DotNetMethodException

Jak mogę rozwiązać ten problem?

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