The guidance for external ids in OEP-32 is currently incorrect and that OEP has been superseded by this [ADR](https://github.com/openedx/edx-platform/blob/e1c8fb51bec2be3aa8da9750cb52b01728d1a740/openedx/core/djangoapps/external_user_ids/docs/decisions/0001-externalid.rst). The OEP needs a significant rework.