Investigate missing events for Duo Workflow Service

Issue

We recently instrumented Duo Workflow Service with workflow start and finish events. For some of the workflows, we never receive success/failure events. Source - https://10az.online.tableau.com/#/site/gitlab/views/DuoRequestWorkflow/DuoWorkflow?:iid=1

Expectation

For every request_duo_workflow event featuring a workflow id, there should be corresponding request_duo_workflow_success or request_duo_workflow_failure event.