Skype for Business in Kiosk Mode - powershell

Question

I would like to run Skype for Business in Kiosk mode, therefore I use the same script as he does, but mine doesn't work.
I replaced the following lines:
$Cashier_SID = Get-UsernameSID("bbwallonepeop")
$ShellLauncherClass.SetCustomShell($Cashier_SID, "C:\Program Files (x86)\Microsoft Office\Office16\lync.exe", ($null), ($null), $restart_shell)
but it doesn't start Skype, it doesn't work with any other app either.
When I run the script, the only thing I see when I log on is a black screen, then I can use ctrl+alt+del to start the Taskmanager, then open the explorer and find the powershell exe to run a disabling script.
So there is something happening, the explorer.exe isn't starting anymore (not even for admins, even though it should start for admins) but Skype isn't starting :/
Any ideas? Here the full script:
$COMPUTER = "localhost"
$NAMESPACE = "root\standardcimv2\embedded"
# Create a handle to the class instance so we can call the static methods.
$ShellLauncherClass = [wmiclass]"\\$COMPUTER\${NAMESPACE}:WESL_UserSetting"
# This well-known security identifier (SID) corresponds to the BUILTIN\Administrators group.
$Admins_SID = "S-1-5-32-544"
# Create a function to retrieve the SID for a user account on a machine.
function Get-UsernameSID($AccountName) {
$NTUserObject = New-Object System.Security.Principal.NTAccount($AccountName)
$NTUserSID = $NTUserObject.Translate([System.Security.Principal.SecurityIdentifier])
return $NTUserSID.Value
}
# Get the SID for a user account named "Cashier". Rename "Cashier" to an existing account on your system to test this script.
$Cashier_SID = Get-UsernameSID("bbwallonepeop")
# Define actions to take when the shell program exits.
$restart_shell = 0
$restart_device = 1
$shutdown_device = 2
# Examples. You can change these examples to use the program that you want to use as the shell.
# This example sets the command prompt as the default shell, and restarts the device if the command prompt is closed.
$ShellLauncherClass.SetDefaultShell("cmd.exe", $restart_device)
# Display the default shell to verify that it was added correctly.
$DefaultShellObject = $ShellLauncherClass.GetDefaultShell()
"`nDefault Shell is set to " + $DefaultShellObject.Shell + " and the default action is set to " + $DefaultShellObject.defaultaction
# Set lync/Skype for busniess as the shell for "Cashier", and restart the machine if it is closed.
$ShellLauncherClass.SetCustomShell($Cashier_SID, "C:\Program Files (x86)\Microsoft Office\Office16\lync.exe", ($null), ($null), $restart_shell)
# Set Explorer as the shell for administrators.
$ShellLauncherClass.SetCustomShell($Admins_SID, "explorer.exe")
# View all the custom shells defined.
"`nCurrent settings for custom shells:"
Get-WmiObject -namespace $NAMESPACE -computer $COMPUTER -class WESL_UserSetting | Select Sid, Shell, DefaultAction
# Enable Shell Launcher
$ShellLauncherClass.SetEnabled($TRUE)
$IsShellLauncherEnabled = $ShellLauncherClass.IsEnabled()
"`nEnabled is set to " + $IsShellLauncherEnabled.Enabled
# Remove the new custom shells.
#$ShellLauncherClass.RemoveCustomShell($Admins_SID)
#$ShellLauncherClass.RemoveCustomShell($Cashier_SID)
# Disable Shell Launcher
#$ShellLauncherClass.SetEnabled($FALSE)
#$IsShellLauncherEnabled = $ShellLauncherClass.IsEnabled()
"`nEnabled is set to " + $IsShellLauncherEnabled.Enabled