Powershell工作流Foreach-Parallel不执行

Question

我尝试通过以下方式并行化某些文件传输：

Workflow DownloadFiles{
    Write-Output "Beginning workflow."
    foreach -parallel ($dir in $destinations)
    {
        try{
            Write-Output "Copying to to: " $dir
            InlineScript{
                 &"$AzCopyPath" /Source:"$sourceDirectory" /Dest:$dir /SourceKey:$sourceKey /Pattern:"$sourcePattern" 
                Write-Output "Copied to: " $dir
            } 
        }
        catch{
            InlineScript{
                $ErrorMessage = $_.Exception.Message
                $FailedItem = $_.Exception.ItemName
                Write-Output $dir : $ErrorMessage  $FailedItem -ForegroundColor Red
            }
        }
        Write-Output "Done";
    }

}

然而，脚本立即结束，没有输出。即使我尝试这个，我也什么也得不到：

Workflow DownloadFiles{
    Write-Output "Beginning workflow."
    Write-Output "Done";
}

我做错了什么？