Id, =, @contactId There are two ways to create a newsletter. Could you please share an example to retrieve unsubscribe status from Marketing Cloud publication lists instead of retrieving from Salesforce Contact object? The next page provides you with the template to fill your newsletter subject and text. I am getting still the Missing subscriber key message. Click Upload and Publish.d. Salesforce, Inc. Salesforce Tower, 415 Mission Street, 3rd Floor . ,