Re-running a group policy preference after "apply once and do not reapply" is checked

I have a group policy preference that maps a few printers on user login.

I have the apply once and do not reapply checked.

I added a new printer.

I wish to rerun this policy on computers that have already had the policy applied so they can receive this new printer.

So I delete this registry key:

HKEY_CURRENT_USER\Software\Microsoft\Group Policy\Client\RunOnce

However, after deleting this registry key, the group policy still does not map the printer I added.

Is there something else I am missing apart from the registry key above?