Blacklist doesn't exist in GPO error message

[KnifMelti]

Discussed in #640

^{Originally posted by Andrew-Griggs June 21, 2024}
Hi all, I'm testing various configurations and I can't seem to get the blacklist working. Every update cycle throws the following error:

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21/06/2024 - CHECK FOR APP UPDATES (System context - Connected user)

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18:52:53 - WAU Policies management Enabled.
18:52:53 - Notification Level: Full. Notification Language: English
18:52:53 - Checking internet connection...
18:52:53 - Connected !
18:52:53 - Winget Version: v1.7.11261
18:52:53 - WAU current version: 1.20.1
18:52:53 - WAU AutoUpdate is Enabled.
18:52:54 - WAU is up to date.
18:52:54 - WAU uses External Lists from: GPO
18:52:54 - WAU uses Black List config
18:52:54 - Critical: Blacklist doesn't exist in GPO, exiting...

I can't see what I'm missing in my config though, here's the policies downloaded from Intune:

What am I missing? Interestingly, if I switch to a whitelist approach everything works perfectly.

[KnifMelti]

From line 239 in Winget-Upgrade.ps1 avoid $toUpdate/$toSkip.GetUpperBound(0), change to:

        #Fix and count the array if GPO List as ERROR handling!
        if ($GPOList) {
            if ($UseWhiteList) {
                if (-not $toUpdate) {
                    Write-ToLog "Critical: Whitelist doesn't exist in GPO, exiting..." "Red"
                    New-Item "$WorkingDir\logs\error.txt" -Value "Whitelist doesn't exist in GPO" -Force
                    Exit 1
                }
                foreach ($app in $toUpdate) { Write-ToLog "Include app ${app}" }
            }
            else {
                if (-not $toSkip) {
                    Write-ToLog "Critical: Blacklist doesn't exist in GPO, exiting..." "Red"
                    New-Item "$WorkingDir\logs\error.txt" -Value "Blacklist doesn't exist in GPO" -Force
                    Exit 1
                }
                foreach ($app in $toSkip) { Write-ToLog "Exclude app ${app}" }
            }
        }