SharePoint Online get size of sites in ROOT

Question

Morning,

I should get a report for sites in ROOT path:

I need to do this with powershell and I'm using this script:

#Config Parameters
$AdminSiteURL="https://SITE.sharepoint.com"
$ReportOutput="C:\windows\Temp\SPOStorageRoot.csv"
 
$spoSize = Import-Csv "C:\Windows\Temp\rootSize.csv"



 
#Connect to SharePoint Online Admin Center with MFA
Connect-SPOService -Url $AdminSiteURL
 
#Array to store Result
$ResultSet = @()
 
ForEach ($spo in $spoSize) {
	Write-Host "Processing Site Collection :"$spo.subsites -f Yellow
	#Send the Result to CSV
	$URL = "https://SITE.sharepoint.com"+$spo.subsites
	$URL.StorageUsageCurrent
	pause
	$Result = new-object PSObject
	$Result| add-member -membertype NoteProperty -name "SiteURL" -Value $URL
	$SorageGB = [System.Math]::round($URL.StorageQuota*1MB/1GB,4)
	$Result | add-member -membertype NoteProperty -name "Allocated" -Value $SorageGB
	$UsedGB = [System.Math]::round($URL.StorageUsageCurrent*1MB/1GB,3)
	$Result | add-member -membertype NoteProperty -name "Used" -Value $UsedGB
	$Result | add-member -membertype NoteProperty -name "Warning Level" -Value  $URL.StorageQuotaWarningLevel
	$ResultSet += $Result
	
    
	#Export Result to csv file
	$ResultSet |  Export-Csv $ReportOutput -notypeinformation
 
	Write-Host "Site Quota Report Generated Successfully!" -f Green
}

But always return 0...

TIA