Script to change logonworkstation in AD when running against multiple users - windows

Question

We are currently experiencing issues with selective user accounts switching from All Computers, to The Following Computers under Logon Workstations in Active Directory.
I'd like to have a way to have a spreadsheet (CSV) that contains usernames, and then run the PowerShell script would read these values and set each user to All Computers under Logon Workstation.
Now, here is a simple script that works perfectly fine - Only thing is that you would have to enter each username manually each time you run this command:
"Set-AdUser -Identity User.Name -LogOnWorkstations $null"
Here is what I thought would work - But ends up not being the case:
$csv = Import-Csv C:\Users\administrator\Desktop\users.csv
Set-AdUser -Identity $csv -LogOnWorkstations $null
If anyone has an idea why my second script isn't working, that would be greatly appreciated!

Answer 1

In the seconds script shall I assume that $csv contains a list of users? If so Set-AdUser does not accept multiple -Identity's. You would need to use a loop is the simplest answer.
$csv = Import-Csv C:\Users\administrator\Desktop\users.csv
$csv | ForEach-Object{
Set-AdUser -Identity $_ -LogOnWorkstations $null
}
This is very dependent on the structure of your CSV. If it has a column for username then you would need to update the cmdlet call.
Set-AdUser -Identity $_.UserName -LogOnWorkstations $null
If the file is just a list of users then don't even bother with Import-CSV
Get-Content C:\Users\administrator\Desktop\users.csv | ForEach-Object{
Set-AdUser -Identity $_ -LogOnWorkstations $null
}