Wait for Checkpoint Transition

Wait-CheckPointTransition.ps1

<#
.SYNOPSIS
Monitor Progress for CheckPoint Encryption or Decryption

.DESCRIPTION
This script is designed to Block the task sequence from continuing if Checkpoint
is in the Encrypting or Decrypting phase. Additionally will display a visual 
progress percentage using the existing SMS Task Sequencing UI framework.

.NOTES
Apache License 2.0

#>

[cmdletbinding()]
param()

write-host "Start CheckPoint Progress script for MDT/SCCM"

$TSENV = New-Object -COMObject Microsoft.SMS.TSEnvironment
$Progress = New-Object -COMObject Microsoft.SMS.TSProgressUI

$CheckPointReg = 'HKLM:\SOFTWARE\WOW6432Node\CheckPoint\EndPoint Security\Full Disk Encryption\Status\Current Boot'

$OrgName = $tsenv.Value('_SMSTSOrgName')
$PackageName = $tsenv.Value('_SMSTSPackageName')
$ProgressMsg = $tsenv.Value('_SMSTSCustomProgressDialogMessage')
$actionName  = $tsenv.Value('_SMSTSCurrentActionName')
$OrgName = $tsenv.Value('_SMSTSOrgName')
$ProgressStep = $tsenv.Value('_SMSTSNextInstructionPointer')
$ProgressMaxStep = $tsenv.Value('_SMSTSInstructionTableSize')

$LastStatus = $null
$StatusDirty = $False

$Status = Get-ItemProperty $CheckPointReg
$status | out-string -Width 200| write-host
while ( $Status.clientStatus -eq '50' -or $Status.ClientStatus -eq '60' ) {
    $StatusDirty = $true
    if ( ([int]$Status.clientStatusDetails) -ne $LastStatus ) {
        $LastStatus = $Status.clientStatusDetails -as [int]
        $TheProgress =  "Progress $($LastStatus)% ..."
        write-host $TheProgress
        $Progress.ShowActionProgress($OrgName,$PackageName,$ProgressMsg,$actionName,$ProgressStep,$ProgressMaxStep,$TheProgress,$LastStatus,100)
    }
    $Status = Get-ItemProperty $CheckPointReg
}

if ($StatusDirty) {
    $progress.ShowTSProgress($OrgName,$PackageName,$ProgressMsg,$actionName,$ProgressStep,$ProgressMaxStep)
}

$status | out-string -Width 200| write-host

write-host "Finished CheckPoint Progress script for MDT/SCCM"

Hi,
I wanted to use the above script to include in the TS. I have added a powershell script command entry at the very bottom of the TS but it doesn't show any display during the TS and ends the TS. What am I missing?

Thanks,
Paul