Once you create a work item, you become the owner of the work item. This enables you to edit, rename and set the privacy status of the work item. The owner or a Site Administrator can change the owner of a work item if, for example, a colleague leaves the team. The owner of a work item is displayed in the detail pane.
The new owner of the work item must be a member of the same work group.
The work item's owner updates to the new user.