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[Michael_Soprano]

The best way to track identities is Identity Map?

Should I use email as a primary identity?

https://developer.adobe.com/client-sdks/edge/identity-for-edge-network/api-reference/#identitymap

[bjoern__koth]

Depends on whether you consider Email to be an identity namespace unique to one specific profile.

If so, flag it as primary.

If not, ECID will/should implicitly be used as a primary identity in your request.