An approval step works when the reviewer can make a decision from the information in front of them. If they have to reconstruct the request in another tool, the workflow has simply moved the reading to a different screen.
Show the proposed action
Put the action in plain language next to the evidence used to prepare it. For an invoice, that could be the amount, the purchase order and the field that failed to match. For a support handoff, it might be the unresolved question and who owns the next reply.
Make returning work easy
Give the reviewer a way to ask for missing context or correct the next step. Test the review with an ambiguous example first. A good pause makes the uncertainty visible and gives someone an obvious way to resolve it.