Escalates an existing triage issue to a fix request on the given release: the issue moves to fixRequested and a fix request is created on that release to carry the work. Requires Triage to be enabled on the app.

A fix maps to a single feature readiness item, so workItems takes at most one code item (PR or commit) and at most one ticket — anything more returns 400. At least one work item is required unless the app's "create PM ticket on triage issue fix request" automation is enabled, in which case a ticket is created and associated automatically. The call returns 400 if the selected code or ticket is already associated with another fix on that release.