Total Size of Preservation Hold Libraries

Hi guys,

I work as a M365 engineer and I have that script that can help to you:

# Requiere: PnP.PowerShell
Import-Module PnP.PowerShell
function Generate-VersionHistoryReport {
    param(
        [Parameter(Mandatory = $true)]
        [string]$SiteURL,
        [Parameter(Mandatory = $true)]
        [string]$ReportOutput
    )
    try {
        Write-Host "Conectando a: $SiteURL" -ForegroundColor Cyan
        Connect-PnPOnline -Url $SiteURL -UseWebLogin
        Write-Host "Procesando Site: $SiteURL" -ForegroundColor Yellow
        $AllRows = @()
        # Hidden library: Preservation Hold Library
        $List = Get-PnPList | Where-Object { $_.Title -eq "Preservation Hold Library" }
        if ($null -eq $List) {
            Write-Host "`tNo se encontró Preservation Hold Library en este sitio" -ForegroundColor DarkYellow
        }
        else {
            Write-Host "`tProcesando biblioteca oculta: $($List.Title)" -ForegroundColor Green
            $ListItems = Get-PnPListItem -List $List.Id -PageSize 2000 -Fields "FileRef","FileLeafRef","FSObjType"
            foreach ($Item in $ListItems) {
                if ($Item["FSObjType"] -ne 0) {
                    continue
                }
                try {
                    $File = Get-PnPProperty -ClientObject $Item -Property File
                    $Versions = Get-PnPProperty -ClientObject $File -Property Versions
                    if ($null -ne $Versions -and $Versions.Count -ge 1) {
                        $VersionSize = 0
                        foreach ($Version in $Versions) {
                            $VersionSize += [int64]$Version.Size
                        }
                        $AllRows += [PSCustomObject]@{
                            Site             = $SiteURL
                            Library          = $List.Title
                            'File Name'      = $File.Name
                            'Version Count'  = $Versions.Count
                            'Version Size-KB'= [math]::Round(($VersionSize / 1024), 2)
                            URL              = $SiteURL.TrimEnd('/') + $File.ServerRelativeUrl
                        }
                    }
                }
                catch {
                    Write-Host "`t`tError procesando archivo: $($Item['FileRef'])" -ForegroundColor Red
                    Write-Host "`t`t$($_.Exception.Message)" -ForegroundColor Red
                }
            }
        }
        if ($AllRows.Count -gt 0) {
            $AllRows | Export-Csv -Path $ReportOutput -Append -NoTypeInformation -Encoding UTF8
        }
        # Subsitios
        $SubWebs = Get-PnPSubWeb -Recurse
        foreach ($SubWeb in $SubWebs) {
            Generate-VersionHistoryReport -SiteURL $SubWeb.Url -ReportOutput $ReportOutput
        }
    }
    catch {
        Write-Host "Error generando Version History Report en $SiteURL" -ForegroundColor Red
        Write-Host $_.Exception.Message -ForegroundColor Red
    }
}
# Parámetros
$SiteURL      = "https://YOURTENANT.sharepoint.com/sites/YOURSITE"
$ReportOutput = "D:\VersionHistoryRpt-preservationhold.csv"
if (Test-Path $ReportOutput) {
    Remove-Item $ReportOutput -Force
}
Generate-VersionHistoryReport -SiteURL $SiteURL -ReportOutput $ReportOutput

Notice in the connect-pnp..... -UseWebLogin  it wont work if you have PnP module updated.

You should change by -Interactive and use an AppRegistration for login with PS