Remind reviewers, return incomplete requests, ask for missing evidence. Every one is ready to run, and you can adjust it in plain language.
Assign missing I-9 follow-up to the named coordinator.
Your onboarding coordinator gets a clear task when a hire approval lacks I-9 evidence. They can see the missing item and the hire packet link.
Keep incomplete leave requests out of the manager review queue.
Your managers see leave requests with the details they need, while employees get a clear request for any missing answer.