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Subscriber Key
A subscriber key is a text field that contains a value that uniquely identifies a subscriber in your Marketing Cloud Engagement account. Marketing Cloud Connect for Marketing Cloud Engagement uses the subscriber key to identify the Sales or Service Cloud record associated with the tracking data returned from Engagement.
The Contact ID, Lead ID, and User ID are converted into the 18-digit subscriber key that is stored in Engagement during sends. These IDs must be included when sending to reports, campaigns, or Salesforce data extensions through Marketing Cloud Connect.
Best Practices for Sending from Multiple Clouds
- Send to a Sales or Service Cloud report, campaign, or Salesforce data extension when sending through Marketing Cloud Connect.
- If manually importing Sales or Service Cloud data files into Engagement, create a custom formula field for Contact and Lead records to generate an 18-digit ID based on the Contact ID, Lead ID, or User ID. Use a text field and input "CASESAFEID(Id)" as the formula, with the Contact or Lead ID in parentheses. When exporting data out of Sales or Service Cloud to import into Marketing Cloud, include this value to use as the subscriber key.
- Send only from a single cloud for each subscriber. For example, use Sales Cloud to send to subscribers who exist first as a contact or lead. Use Engagement to send to subscribers who didn’t originate in Sales Cloud.
- If you want to send to the same recipients from both Engagement and Sales or Service Cloud, implement extra measures to manage subscriptions across clouds. Contact your Engagement account executive for further assistance.
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