当你有一个代码块，它只为一个用户执行任务，那么你会想把 * 整个东西 * 放在你的循环体中，然后确保在每次循环迭代开始时将当前用户的UPN分配给$UPN变量：

# read list of user records from disk
$users = Import-Csv path\to\users.csv

# iterate over list 
foreach($user in $users) {
  # grab upn value from the CSV record instead of using a hard-coded value
  $UPN = $user.UPN

  # everything else remains the same
  $User = Get-AzureADUser -ObjectId $UPN
  $License = New-Object -TypeName Microsoft.Open.AzureAD.Model.AssignedLicense
  $License.SkuId = "3b555118-da6a-4418-894f-7df1e2096870"
  $LicensesToAssign = New-Object -TypeName Microsoft.Open.AzureAD.Model.AssignedLicenses
  $LicensesToAssign.RemoveLicenses = $License.SkuId
  Set-AzureADUserLicense -ObjectId $User.ObjectId -AssignedLicenses $LicensesToAssign
}

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以上假设CSV文件包含一个包含UPN值的UPN列