The privacy extension to ISO 27001.
ISO 27701 extends an ISO 27001 ISMS into a privacy information management system (PIMS). It adds controls for PII controllers and processors and maps to GDPR articles. You cannot certify to 27701 alone; it rides on a 27001 certificate.
These controls exist because the platform needs them to run safely. The crosswalk reads their signed evidence against ISO 27701. Where there is no evidence, the report says gap.