SharePoint Online – How to get the size of recycle bin using PnP PowerShell

if (Get-Module -ListAvailable -Name "PnP.PowerShell") {
        Write-Host "Module is installed."
    } else {
        Write-Host "Module is not installed."
        Install-Module PnP.PowerShell -Scope CurrentUser -Force
    }

if(-not (Get-Module -Name "PnP.PowerShell"))
    {
        Import-Module -name "PnP.PowerShell"
    }

$clientID = "<my client id>"
$tenantId = "knowledgejunction1.onmicrosoft.com" 
$certificatePath = "C:\Prasham\m365junction.pfx"
$SiteURL = "https://knowledgejunction1.sharepoint.com/"
$CertificatePassword = "<my certificate password>"
$CertificatePassword = (ConvertTo-SecureString -AsPlainText $CertificatePassword -Force)
$KJSite = Connect-PnPOnline -Url $siteURL -ClientId $ClientId 
          -Tenant $tenant -CertificatePath $CertificatePath 
          -CertificatePassword $CertificatePassword -ReturnConnection
if($KJSite){
        Write-Host Connected to the KJ tenant successfully
    }

#calculating size of Second Stage recycle bin items
    $SecondStageRecycleBinItems = Get-PnPRecycleBinItem -Connection $KJSite -SecondStage
    #ensure, second stage recycle bin is not empty
    $SecondStageRBItemsCount = $SecondStageRecycleBinItems.Count
    Write-Host "Total number of items in Second Stage Recycle Bin " $SecondStageRBItemsCount
    if($SecondStageRBItemsCount -gt 0)
    {
        $SecondStageRBSize = ($SecondStageRecycleBinItems | Measure-Object -Property Size -Sum).Sum
        Write-Host "Second Stage Recycle Bin Item Size in  " $SecondStageRBSize
        $SecondStageRBSize_MB = [Math]::Round($SecondStageRBSize / 1MB, 2)
        Write-Host "Second Stage Recycle Bin Item Size in MB " $SecondStageRBSize_MB
    }

<#
.SYNOPSIS
    This script calculates the size of first stage and second stage recycle bin of given URL  
.DESCRIPTION
    PowerShell script to get the size of first stage and second stage recycle bin
.NOTES
    Author: Prasham Sabadra
    Version 1.0 - initial release
#>
# High level steps
# 1. Connect to the site for which we need to get the Reccycle Bin items size
# 2. Get the Recycle Bin items
# 3. Get the size of first level recycle bin
# 4. Get the size of second level recycle bin
#region - Parameter declaration
    $tenant = "knowledgejunction1.onmicrosoft.com"
    $siteURL = "https://knowledgejunction1.sharepoint.com/"
    $ClientId = "<my client id>"
    $CertificatePath = "C:\Users\u1086350\Documents\Prasham\m365KJ.pfx"
    $CertificatePassword = "<my certificate password>"
#endregion
#region - Module Check
    # Check if PnP PowerShell is installed
    if (Get-Module -ListAvailable -Name "PnP.PowerShell") {
        Write-Host "Module is installed."
    } else {
        Write-Host "Module is not installed."
        Install-Module PnP.PowerShell -Scope CurrentUser -Force
    }
    #As we are using PnP PowerShell module, check if PnP PowerShell module is imported
    if(-not (Get-Module -Name "PnP.PowerShell"))
    {
        Import-Module -name "PnP.PowerShell"
    }
#endregion
#region - Connect to the site for which we need to get the Reccycle Bin items size
    
    $CertificatePassword = (ConvertTo-SecureString -AsPlainText $CertificatePassword -Force)
    $KJSite = Connect-PnPOnline -Url $siteURL -ClientId $ClientId -Tenant $tenant -CertificatePath $CertificatePath -CertificatePassword $CertificatePassword -ReturnConnection
    if($KJSite)
    {
        Write-Host Connected to the KJ tenant successfully
    }
#endregion
try{
#region - Read the recycle bin values
    #calculating size of First Stage recycle bin items
    #get the recycle bit items - by default it returns items from the first stage recycle bin
    $FirstStageRecycleBinItems = Get-PnPRecycleBinItem -Connection $KJSite
    #ensure, first stage recycle bin is not empty
    $FirstStageRBItemsCount = $RecycleBinItems.Count
    Write-Host "Total number of items in First Stage Recycle Bin " $FirstStageRBItemsCount
    if($FirstStageRBItemsCount -gt 0)
    {
        $FirstStageRBSize = ($FirstStageRecycleBinItems | Measure-Object -Property Size -Sum).Sum
        Write-Host "First Stage Recycle Bin Item Size in  " $FirstStageRBSize
        $FirstStageRBSize_MB = [Math]::Round($FirstStageRBSize / 1MB, 2)
        Write-Host "First Stage Recycle Bin Item Size in MB " $FirstStageRBSize_MB
    }
    #calculating size of Second Stage recycle bin items
    $SecondStageRecycleBinItems = Get-PnPRecycleBinItem -Connection $KJSite -SecondStage
    #ensure, second stage recycle bin is not empty
    $SecondStageRBItemsCount = $SecondStageRecycleBinItems.Count
    Write-Host "Total number of items in Second Stage Recycle Bin " $SecondStageRBItemsCount
    if($SecondStageRBItemsCount -gt 0)
    {
        $SecondStageRBSize = ($SecondStageRecycleBinItems | Measure-Object -Property Size -Sum).Sum
        Write-Host "Second Stage Recycle Bin Item Size in  " $SecondStageRBSize
        $SecondStageRBSize_MB = [Math]::Round($SecondStageRBSize / 1MB, 2)
        Write-Host "Second Stage Recycle Bin Item Size in MB " $SecondStageRBSize_MB
    }
#endregion
} #try
catch{
    <#
        Logging the error details occurred in error file
    #>        
        Write-Host $($_.Exception.Message)
        Add-Content ErrorLogs.txt $($_.Exception.Message)
}#catch
finally {
    <#Do this after the try block regardless of whether an exception occurred or not#>
}