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Configure Omnichannel Journey Settings in Marketing Cloud Engagement
After the scheduled activation, a data extension is added to the Marketing Cloud Engagement business unit identified in activation. Edit this data extension and update its send relationship to relate the MobilePush Key attribute to SubscriberKey. As a result, Journey Builder defaults all orchestration, personalization, and sending lookups based on the value of the MobilePush Key (representing the MobilePush SubscriberKey selected from the Calculated Insight you created).

