Get all Libraries With No Retention Label

I am setting off to do the same thing, here is what I have for all libraries in a site. You'll just need to add foreach Site in AllSites...

#Parameters
$SiteURL = "https://changeme.sharepoint.com/sites/siteA"
 
#Connect to PnP Online
Connect-PnPOnline -Url $SiteURL -Interactive

#Get the Root Web
$Web = Get-PnPWeb

#Get all lists
$Lists = Get-PnPList

#exclude system lists
$systemLibs = @("Form Templates","Site Assets", "Site Pages", "Style Library")

foreach ($list in $Lists) {
    if ($list.Hidden -eq $true) {
        Write-Host "  Skipped hidden: " $list.Title -ForegroundColor Gray
    } else {
        if ($systemLibs.Contains($list.Title)) {
            Write-Host "  Skipped system lib: " $list.Title -ForegroundColor Gray

        } else {
           Write-Host $list.Title -ForegroundColor Yellow
            Get-PnPLabel -List $list #-ValuesOnly "TagName"

        }

    }
}

Disconnect-PnPOnline  #Friends dont let friends leave connections open