Deletes one skill. Send the skill's extension in the body as confirmation, or its name for a skill with no extension. Refused with 409 when the skill is the tenant's default skill, has calls in queue, or is routed to by another skill (queue timeout, queue overflow, max calls in queue, or end-of-day overflow). IVR call flows that route to the skill are not checked. Reports filtered on a deleted skill's name keep their history but gain no new data.