用于备份清理的 Powershell 脚本在 Windows Server 2016 中不起作用

问：

我一直在开发一个 PowerShell 脚本，该脚本会删除备份文件夹并仅保留最新的 3 个备份文件夹。我使用任务计划程序按计划测试运行脚本，并且它可以工作。 但是，当我在装有 Windows Server 2016 的计算机上实现它时，它会运行并提示完成脚本，但不会删除文件夹。我知道脚本已执行，因为我在脚本中附加了电子邮件通知详细信息。我收到提示完成任务的电子邮件，但未进行删除。

我在下面附上了我正在使用的脚本，希望我能在这个问题上得到一些帮助。

  # Gets path of Backup folder
$backup_path = 'C:\Backup'

  # Getting the subfolders inside the Backup folder
$subfolders = Get-ChildItem -Path $backup_path -Directory -Force

  # Checks if the number of folders is more than 3**
if ($subfolders.Count -gt 3) {

    # Sort subfolders by Creation Time
    $sorted_subfolders = $subfolders | Sort-Object -Property CreationTime

    # Getting number of subfolders to delete
    $delete_count = $subfolders.Count - 3

    # Deletes the subfolders and their contents
    $sorted_subfolders[0..($delete_count - 1)] | Remove-Item -Force -Recurse -ErrorAction SilentlyContinue

    # Write a message to the console when deletion complete 
    Write-Output "Deleted $($delete_count) subfolders"

    # Create a string for email with the folder names
    $email_body = "The Backup Management Script Has been Executed Successfully!`n`n" +
                  "The following folders were deleted from the SQL backup folder:`n" +
                  ($sorted_subfolders[0..($delete_count - 1)].Name -join "`n") + "`n`n" +
                  "The following folders are left in the SQL backup folder:`n" +
                  ($sorted_subfolders[$delete_count..($subfolders.Count - 1)].Name -join "`n")

}
else {
    # Writes email to Admin when Latest 3 Backup folders are left**

    $email_body = "No backup Folder Older than 3 Days Have been Found!`n Please Check If the Backup has run as scheduled."
}

   # Sends email notification
    $SmtpClient = new-object system.net.mail.smtpClient
    $MailMessage = New-Object system.net.mail.mailmessage
    $SmtpClient.Host = "SMTP server IP"
    $mailmessage.from = ("[email protected]")
    $mailmessage.To.add("[email protected]")
    $mailmessage.Subject = "Backup Cleanup Job"
    $mailmessage.Body = $email_body
    $smtpclient.Send($mailmessage)

我尝试将执行策略更改为 RemoteSigned，但它仍然没有删除该文件夹。 备份文件夹位于共享文件夹中，因此我将其移出到服务器上的本地文件夹中。该脚本可以检测文件夹并提取文件夹的名称，但似乎无法删除这些文件夹。