CHW-4213 UnknownRole

unknown role; supply a built-in role slug or an existing custom role in this org

Default message: unknown role; supply a built-in role slug or an existing custom role in this org
HTTP status: 400 (client)

Problem. The supplied role slug does not resolve. Cause. The slug is neither a built-in role (global-admin, org-admin, owner, manager, member) nor an existing custom role in this org. Fix. List valid roles via GET /api/orgs/{id}/roles and resubmit. HTTP 400.