Powershell Clean up Folder Names - Rename Folders and Subfolders Recursively

Dan_CS It's the special characters, if you replace @ with at for example, it does work for me

$Source_Folder = 'd:\temp\Test'
$folders = Get-ChildItem -LiteralPath $Source_Folder -Directory 
Foreach ($folder in $folders) {  
    $new_folder_name = $folder.Name
    
    # Remove Characters
    $new_folder_name = $new_folder_name -replace '#', ' '
 
    # Remove Hyphen with _
    $new_folder_name = $new_folder_name -replace '-', '_'

    # Remove @ with at
    $new_folder_name = $new_folder_name -replace '@', 'at'
	
    # and some more replacements......

    Write-Host "Renaming:" $folder.FullName "to" $new_folder_name
    Rename-Item "$($folder.FullName)" "$($new_folder_name)" -Verbose
}