New-ADUser unable to concatanate name and domainname - windows

Question

I'm trying to create userprincipalname as combination of username and hardcoded domainname
csv file:
name,displayname,givenname,surname
dhall,Don Hall,Don,Hall
Code:
Import-csv "c:\output.csv" | ForEach-Object {new-aduser -name $_.name -UserPrincipalName ("{0}#{1}" -f $_.name,"Dev.domain.Net") -DisplayName "$($_.givenname $_.surname)" -givenName $_.givenname -surname $_.surname -path "OU=Workspaces,DC=Dev,DC=domain,DC=Net" -AccountPassword (convertto-securestring passs -asplaintext -force) -Enabled [System.Convert]::toboolean($true)) -ChangePasswordAtLogon ([system.convert]::ToBoolean($true))}
And getting:
At line:1 char:159
+ ... -f $_.name,"Dev.domain.Net") -DisplayNa
+
Unexpected token '$_' in expression or stateme
+ CategoryInfo : ParserError: (:)
+ FullyQualifiedErrorId : UnexpectedToken
Tried also -UserPrincipalName ([string]::Concat($_.name,"#dev.domain.net"))
but same error
PS C:\> $PSVersionTable.PSVersion
Major Minor Build Revision
----- ----- ----- --------
5 1 14393 1944
Windows server 2016

Answer 1

Not sure what's causing that error (don't have an AD controller to test against at the moment so can't validate) but in cases where I'm going to need to reuse a property multiple times I tend to assign it to a temporary variable (makes it slightly easier to write the code and don't run into issues with the pipeline variable getting updated).
Import-CSV "c:\output.csv" | ForEach-Object {
$name = $_.name
$upn = "{0}#{1}" -f $name,"dev.domain.net"
New-ADUser -Name $name -UserPrincipalName $upn #...
}