SharePoint Online: Get Recycle Bin Storage Size using PowerShell

#Load SharePoint CSOM Assemblies
Add-Type -Path "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.dll"
Add-Type -Path "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.Runtime.dll"
  
#Variables for Processing
$SiteUrl = "https://Crescent.sharepoint.com/Sites/Marketing"

#Setup Credentials to connect
$Cred = Get-Credential
  
Try {
    #Setup the context
    $Ctx = New-Object Microsoft.SharePoint.Client.ClientContext($SiteURL)
    $Ctx.Credentials = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($Cred.UserName,$Cred.Password)
  
    #Get the Site collection's recycle bin: both 1st stage and 2nd stage
    $RecycleBinItems = $Ctx.Site.RecycleBin
    $Ctx.Load($RecycleBinItems)
    $Ctx.ExecuteQuery()

    #Get Size of the Recycle bin items
    $RecycleBinSize = $RecycleBinItems | Measure-Object Size -Sum

    Write-Host -f Green "Total Recycle Bin Size: $($RecycleBinSize.Sum/1MB) MB"
    
}
Catch {
    write-host -f Red "Error:" $_.Exception.Message
}

#Load SharePoint CSOM Assemblies
Add-Type -Path "C:\Program Files\SharePoint Online Management Shell\Microsoft.Online.SharePoint.PowerShell\Microsoft.SharePoint.Client.dll"
Add-Type -Path "C:\Program Files\SharePoint Online Management Shell\Microsoft.Online.SharePoint.PowerShell\Microsoft.SharePoint.Client.Runtime.dll"
Add-Type -Path "C:\Program Files\SharePoint Online Management Shell\Microsoft.Online.SharePoint.PowerShell\Microsoft.Online.SharePoint.Client.Tenant.dll"
 
#Function to Get the recycle bin Size of a SharePoint Online site collection
Function Get-SPOSiteRecycleBinSize($SiteURL, $Cred)
{ 
    #Setup credentials
    $Credentials = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($Cred.Username, $Cred.Password)

    #Set up the context
    $Context = New-Object Microsoft.SharePoint.Client.ClientContext($SiteURL) 
    $Context.Credentials = $Credentials
   
    $Site = $context.Site
    $RecycleBin = $Site.RecycleBin
    $context.Load($Site)
    $context.Load($RecycleBin)
    $context.ExecuteQuery()

    $FirstStageSize=0
    $SecondStageSize=0

    Foreach($Item in $RecycleBin)
    {
        If($Item.itemState -eq "FirstStageRecycleBin")
        {
          $FirstStageSize+=$Item.Size
        }
        Else
        {
          $SecondStageSize+=$Item.Size
        }
    }
    #Output the results
    $Data ="Site Collection URL {0}. First Stage Recycle Bin Size {1}. Second Stage Recycle Bin Size {2}" -f $SiteURL,$FirstStageSize,$SecondStageSize
    Write-host -f Green $Data
}

#Get All Site collections from the Tenant- Including Modern Team sites and communication sites
Function Get-SPOSites($AdminSiteURL, $Cred)
{
    #Setup credentials to connect
    $Credentials = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($Cred.Username, $Cred.Password)
  
    #Setup the context
    $Ctx = New-Object Microsoft.SharePoint.Client.ClientContext($AdminSiteURL)
    $Ctx.Credentials = $Credentials
 
    #Get the tenant object 
    $Tenant = New-Object Microsoft.Online.SharePoint.TenantAdministration.Tenant($ctx)
 
    #Get All Site Collections
    $SiteCollections=$Tenant.GetSitePropertiesFromSharePoint(0,$true)
    $Ctx.Load($SiteCollections)
    $Ctx.ExecuteQuery()

    #Iterate through Each site collection
    ForEach($Site in $SiteCollections)
    {
        Write-host -f Yellow "Searching Site Collection:"$Site.URL
        Get-SPOSiteRecycleBinSize -SiteUrl $Site.Url -Cred $Cred
    }
}
 
#Set Parameters
$AdminSiteUrl = "https://crescent-admin.sharepoint.com/"
$Cred= Get-Credential

Get-SPOSites -AdminSiteURL $AdminSiteUrl -Cred $Cred

#Config Variables
$SiteURL = "https://Crescent.sharepoint.com/sites/marketing"

#Connect to PnP Online
Connect-PnPOnline -Url $SiteURL -Credentials (Get-Credential)

#Sum Recycle bin Items Size
$RecycleBinSize = Get-PnPRecycleBinItem | Measure-Object -Property Size -Sum

#Get Recycle bin size
Write-host "Recycle Bin Size (MB):" ([Math]::Round($RecycleBinSize.Sum/1MB,2))