Fix “Another site or list is still using this content type” Error in SharePoint Online

#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"

Function Get-ContentTypeUsage()
{ 
    param
    (
        [Parameter(Mandatory=$true)] [string] $SiteURL,
        [Parameter(Mandatory=$true)] [string] $ContentTypeName,
        [Parameter(Mandatory=$true)] [string] $ReportFile        
    )

    Try {
        $Cred= Get-Credential
        $Credentials = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($Cred.Username, $Cred.Password)
        Write-host "Processing Site:"$SiteURL
        #Setup the context
        $Ctx = New-Object Microsoft.SharePoint.Client.ClientContext($SiteURL)
        $Ctx.Credentials = $Credentials
    
        #Get the content type from web
        $ContentTypeColl = $Ctx.Web.ContentTypes
        $Ctx.Load($ContentTypeColl)
        $Ctx.ExecuteQuery()
        
        #Array to hold result
        $Results = @()

        #Get all lists and libraries from the site
        $Ctx.Load($ctx.Web.Lists)
        $Ctx.Load($Ctx.Web.Webs)
        $Ctx.ExecuteQuery()

        Foreach($List in $Ctx.Web.Lists)
        {
            $Ctx.Load($List.ContentTypes)
            $Ctx.ExecuteQuery()
       
            #Check if the content type exists in the list        
            $ContentType = $List.ContentTypes | Where {$_.Name -eq $ContentTypeName}
            If($ContentType -ne $Null)
            { 
                $Results += New-Object PSObject -Property @{
                'Site' = $SiteURL
                'List Name' = $List.Title
                'URL'= $SiteURL+$List.DefaultViewURL
                }
                Write-host "Found Content Type Reference at '$($List.Title)' in site '$SiteURL'" -f Green
            }
        }
        #Export Results to CSV
        $Results | Export-Csv $ReportFile -Append -NoTypeInformation

        #Process subsites - Call the function recursively
        If($Ctx.Web.Webs.Count -gt 0)
        {
            Foreach ($web in $Ctx.Web.Webs)
            {
                Get-ContentTypeUsage -SiteURL $web.Url -ContentTypeName $ContentTypeName -ReportFile $ReportFile
            }
        }
  }
    Catch {
        write-host -f Red "Error Deleting Content Type!" $_.Exception.Message
    }
}

#Set parameter values
$SiteURL="https://crescent.sharepoint.com/"
$ContentTypeName="Project Template"
$ReportFile="C:\Temp\ContentTypeRef.csv"

#Delete the Output report file if exists
if (Test-Path $ReportFile) { Remove-Item $ReportFile }

#Call the function
Get-ContentTypeUsage -SiteURL $SiteURL -ContentTypeName $ContentTypeName -ReportFile $ReportFile