CM4SF_ADD_DELETE_SUBSCRIBER
What this means: Adding or removing a subscriber from a Campaign Monitor list failed.
Common causes: Invalid email; list permissions; confirmed opt-in requirements; Campaign Monitor API failure; Salesforce field access.
What to do: Read the Maintenance message. Review field mappings and permissions. Confirm the list and subscriber state in Campaign Monitor. Guide: Subscriber Lists.
To see all maintenance codes please click here.
