When we use workflow inside DAX it works fine with all approvals, but as you know for power automate to handle approvals DAX sends business event requests.

If we configure work item of workflow with work item queue, business event doesn’t populate workflow user’s email in business event’s JSON request.

This is how I believe it is expected to work - If a work item queue is configured with three users to accept/approve any workflow task, then business event should send approval request to all three or at least one admin user from queue configuration instead of blank.

Blank user in template for approvals causes failure in power automate.