I have 2 schemas, the web SDK event schema, and for profile, I have set email as a primary identity, but I'm not sure how to set primary identities to the event schema for ECID.

Hi Community,I am trying to integrate Adobe Commerce with Adobe Experience Platform (AEP) using the Data Connection extension.I have created an event schema and a profile schema.I noticed that I cannot choose ECID (it seems to be default and not selectable).Now I want to know what type of Identity N...