Solved
Difference between CORE and ECID , how to set up Identity Map
What is the difference? Should I set up Core and ECID in Tags in Identity Map?
Should I put ECID into Identity Map if it should be retrieved through Data Collection?
According to the documentation, the CORE namespace is used when third-party cookies are enabled and the value is stored in a demdex domain cookie instead of the ECID.
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