Passing the /s /v"MSI Parameters" To Setup.exe with --params

I am currently having an issue with trying to pass parameters over to an InstallShield setup.exe
Here is my script:
NOTE: First part of script downloads a zip file and extracts to c:\Software

$packageArgs = @{
packageName = 'isspackage'
softwareName = 'Install Shield Package'
fileType = 'exe'
file64 = "C:\Software\isspackage\setup.exe"
silentArgs = "/s /v"
validExitCodes = @(0, 3010, 1641)
}

$additionalArgs = Get-PackageParameters
if($additionalArgs['SETUPTYPE']) {
$packageArgs['silentArgs'] += " SETUPTYPE=$($additionalArgs['SETUPTYPE'])"
}

Install-ChocolateyPackage @packageArgs

So trying to do this:
choco install isspackage --params "/SETUPTYPE=Scanning" -y

The install returns back as successful, but I never even see setup.exe load.
So I know I am missing something.
Any Ideas?

Start with the package script's file64 and silentArgs values, then compare the generated command line with the InstallShield setup.exe parameters described in the issue. Reproduce the choco install isspackage --params invocation and determine whether setup.exe launches and receives SETUPTYPE; no repository file or test is identified in the issue.

Written by the indexing model from the issue text.