SMA Killing lingering sessions

gistfile1.ps1

#ChildRunbook to stop lingering sessions which is called inline
workflow Stop-LingeringSession {
    param (
        [Parameter(Mandatory)]
        [Int] $ProcessId,

        [Parameter(Mandatory)]
        [String] $Server,

        [Parameter(Mandatory)]
        [PSCredential] $Credential
    )

    try {
        $Null = inlinescript {
            $CimSession = New-CimSession -ComputerName $using:Server -Authentication CredSsp -Credential $using:Credential
            if ($process = Get-CimInstance -ClassName win32_process -CimSession $CimSession -Filter "ProcessId = '$using:ProcessId'") {
                $process | Invoke-CimMethod -MethodName terminate | Out-Null
            }
            $CimSession | Remove-CimSession
        }
    }
    catch {
        # Do nothing
    }
}

#Runbook with inlinescript activity
#When runbook is finished, the associated PID is killed by Stop-LingeringSession childrunbook
workflow Test-Runbook {

    [OutputType([PSCustomObject])]

    param (
        [Parameter(Mandatory)]
        [string] $MyInput
    )

    Write-Verbose -Message 'Running Runbook: Test-Runbook'
    Write-Verbose -Message "MyInput: $MyInput"

    $Creds = Get-AutomationPSCredential -Name 'TestCredentials'
    $Server = Get-AutomationVariable -Name 'MyServer'

    $OutputObj = [PSCustomObject] @{}

    try {
        [PSCustomObject]$ResultObj = inlinescript {
            $ErrorActionPreference = 'Stop'
            $VerbosePreference = [System.Management.Automation.ActionPreference]$Using:VerbosePreference
            $DebugPreference = [System.Management.Automation.ActionPreference]$Using:DebugPreference 

            $InlineObj = [PSCustomObject]@{}

            Add-Member -InputObject $InlineObj -MemberType NoteProperty -Name 'ProcessId' -Value $PID -Force
            Add-Member -InputObject $InlineObj -MemberType NoteProperty -Name 'HostName' -Value "$env:COMPUTERNAME.$env:USERDNSDOMAIN" -Force

            Add-Member -InputObject $InlineObj -MemberType NoteProperty -Name 'MyInput' -Value $using:MyInput -Force

            return $InlineObj
        } -PSComputerName $Server -PSCredential $Creds

        if ($ResultObj.ProcessId) {
            Stop-LingeringSession -ProcessId $ResultObj.ProcessId -Server $ResultObj.HostName -Credential $Creds
        }
    }
    catch {
        Write-Error -Message "Exception happened in runbook Test-Runbook: $($_.Message)" -ErrorAction Continue
        Add-Member -InputObject $OutputObj -MemberType NoteProperty -Name 'error' -Value $_.message
    }

    Add-Member -InputObject $OutputObj -MemberType NoteProperty -Name 'MyInput' -Value $ResultObj.MyInput -Force

    if ($ResultObj.ProcessId) {
        Stop-LingeringSession -ProcessId $ResultObj.ProcessId -Server $ResultObj.Hostname -Credential $Creds
    }

    return $OutputObj
}