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Unexpected token $_ in Powershell command

I'm trying to bulk modify AD users UPN suffix with a Powershell script (below).

Import-Module ActiveDirectory
$oldSuffix = "canitpro.local"
$newSuffix = "rebeladmin.com"
$ou = "DC=canitpro,DC=local"
$server = "DCM1"
Get-ADUser -SearchBase $ou -filter * | ForEach-Object {
$newUpn = $_.UserPrincipalName.Replace($oldSuffix,$newSuffix)
$_ | Set-ADUser -server $server -UserPrincipalName $newUpn

But I keep getting the error: Unexpected token '$_' in expression or statement

What is wrong with the $_ ?

I thought it represented every object in the pipeline?

Many thanks for any help
PowershellActive Directory

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8/22/2022 - Mon

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Many thanks oBdA,

I'm trying to run it direct in the console.
I will cut and paste again from here and see.
Will update you soon.

Many thanks again

Thanks oBdA, worked a treat.

Being a newbie to powershell can I ask why I should use the -replace statement not the Replace() method?

Is it solely down to being case sensitive?

Many thanks again

In this case because it's case insensitive.
As an alternative, you can make the string all lower before replacing, but that would include the part not to be replaced; that might not be what you want:
	$newUpn = $_.UserPrincipalName.ToLower().Replace($oldSuffix, $newSuffix)

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Note that the -replace operator is actually way more powerful than the Replace() method - it uses a Regular Expression for the pattern to replace.
So don't go replacing the method with the operator all over the place before reading up on Regular Expressions.
To be completely correct, the "." in the name would need to be escaped with a backslash (or using [regex]::Escape()) since the "." means "any character" in RegEx, but in this case, it's rather safe to leave it in.
	$newUpn = $_.UserPrincipalName -replace ([regex]::Escape($oldSuffix)), $newSuffix

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