Fields to Review or Create

You may need to add an Audience, or add new fields to an existing one
Consider your Audience Settings and Merge Tags
- To add the Salesforce Contact/Lead ID or Address fields, make sure they are set up as text fields (Mailchimp formatted fields don’t play nicely with Salesforce fields).
You may want/need to add GDPR fields

If your Salesforce allow the same email address to be present across multiple contact or lead records, consider adding a checkbox or picklist field to help Chimpegration to determine which record it should update. See here for more information about ‘shared email settings’.
If you would like to record the status of a record in Mailchimp on to the associated record within Salesforce, consider adding a Custom Picklist field with the values of ‘Subscribed’, ‘Unsubscribed’, ‘Hard Bounced’, and ‘Marked as Spam’. See here for more information on how Chimpegration can update this field