To facilitate our Agile workflow we have both an active open sprint and a "next" sprint which has not yet been started. Adding tickets to the "next" sprint via the web UI works fine, but I would like to be able to add tickets to this sprint via REST for some internal tools.

Currently, the "next" sprint does not show up in results for sprints/rapid_view_id. Attempting to guess the sprint ID (incrementing the ID of the open sprint) and attempting to add the ticket using sprint/sprint_id/issues/add yields a "Sprint does not exist" error.