Northern Trail Outfitters (NTO) uses data extensions for all of their email audiences. A customer reports they unsubscribed several week-end ago, but continue to receive NTO's daily digest at their old address. NTO's Marketing cloud Admin has confidently deleted them from present in the appropriate data extension.
What consideration could account for this behavior?
A Marketing Cloud admin wants to check the status of a salesforce contacts in All Subscribers. The account is connected to their salesforce org via Marketing Cloud
Connect.
Which subscriber key should be used to search for the contact in All Subscribers?