Importing email addresses into AD - powershell

Question

I'm using a powershell script to try to import email addresses into Active Directory. Here is the script I'm using (full disclosure, I copied this from another post on this site):
Import-module ActiveDirectory
$Users = Import-CSV "C:\Users\Admin\Documents\HPD_Users.csv"
ForEach($User in $Users)
{
Set-ADUser -Identity $User.UserName -EmailAddress $User.Email
}
The error I'm getting is:
Set-ADUser : Cannot find an object with identity: 'Smith, John' under: 'DC=abc,DC=wxyz,DC=com'.
At C:\Users\Admin\Documents\Import_AD_Email.ps1:5 char:5
+ Set-ADUser -Identity $User.UserName -EmailAddress $User.Email
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : ObjectNotFound: (Smith, John:ADUser) [Set-ADUser], ADIdentityNotFoundException
+ FullyQualifiedErrorId : ActiveDirectoryCmdlet:Microsoft.ActiveDirectory.Management.ADIdentityNotFoundException,Microsoft.ActiveDirectory.Management.Commands.SetAD
User
I think the issue is that we have the users in a specific OU. How do I specify that in the script?

Answer 1

Like Santiago mentioned, looks like the issue here is that $User.UserName is actually the DisplayName attribute in Active Directory.
The best and most performant way to do this would be to run it against the sAMAccountName - but if all you have access to is the DisplayName in your CSV, you could try something along these lines instead;
Import-module ActiveDirectory
$Users = Import-CSV "C:\Users\Admin\Documents\HPD_Users.csv"
ForEach($User in $Users)
{
$ADUser = Get-ADUser -Filter { DisplayName -like $User.UserName } -Properties DisplayName
Write-Host "Updating email for [$($ADUser.DisplayName)] to [$($User.Email)]"
#Set-ADUser $ADUser -EmailAddress $User.Email -WhatIf
}

Answer 2

Finally got it to work using sAMAccountName. Here was my final script:
Import-module ActiveDirectory
$Users = Import-CSV "C:\Users\Admin\Documents\HPD_Users3.csv"
ForEach($User in $Users)
{
Set-ADUser -Identity $User.sAMAccountName -EmailAddress $User.Email
}
And my CSV file looked like this:
Email,sAMAccountName
john.smith#abc.com,jsmith
jane.doe#abc.com,jdoe