CHW-4504 PlanAssignmentInvalid

plan assignment requires both orgId and planId in the request body

Default message: plan assignment requires both orgId and planId in the request body
HTTP status: 400 (client)

Problem. PUT /api/usage/plans/assign returned 400. Cause. The request body was missing orgId, planId, or both. Fix. Send a JSON body containing both fields. HTTP 400.