Change AD Display name from Lastname, Firstname to Firstname Lastname

My organization wants to change the Display name format to Firstname Lastname instead of Lastname, Firstname

I already change the format for creating new users in the ADSI settings. But want to change all current users display name to Firstname Lastname

I found a script in: Default full name format in Active Directory

Get-ADUser -LDAPFilter "(&(objectCategory=person)(!displayName=*,*)(displayName=*))" |
ForEach-Object {  
    Set-ADUser $_ -DisplayName "$($_.Surname), $($_.givenName)"
}

This change it from Firstname Lastname to Lastname, Firstname. I want to do a reverse, so I tweak this script to:

Get-ADUser -LDAPFilter "(&(objectCategory=person)(!displayName=*,*)(displayName=*))" |
ForEach-Object {  
    Set-ADUser $_ -DisplayName "$($_.givenName) $($_.Surname)"
}

But my AD users have still a display name like Lastname, Firstname. PS do not give any warnings or errors and did a refresh in AD.

Do someone knows a trick to change all AD users to Firstname Lastname as Displayname?

Solution 1:

The problem is the filter. The string (!displayName=*,*) indicates that only user who currently don't have a , in their displayname should be changed. You want the inverse, so you need to remove the !.

Get-ADUser -LDAPFilter "(&(objectCategory=person)(displayName=*,*))" |
ForEach-Object {  
    Set-ADUser $_ -DisplayName "$($_.givenName) $($_.Surname)"
}