When you create or modify a WSUS Automatic Approval Rule you might expect to see the change reflected on the approval of current updates but it does not happen automatically. The approval rules are applied at the time an update is first synchronized to the WSUS server. This means the updates that have already been synchronized will not have the new or updated rule applied.

To retroactively apply a rule open the Update Services console and go to Options > Automatic Approvals > click ‘Run Rule’ on the new or modified rule.