I'm looking for any information on how "Lead Activity Type (9) Unsubscribe Email" is used and/or how it happens? The activity type description states "Person unsubscribed from Marketo Emails" but I have tried Unsubscribing within the UI and that only gets sent across the API via activity type (13) Changed Data Value with a primaryAttributeValueID of (80) Unsubscribed. When I send out an email and a customer unsubscribes through Marketo form this activity is logged also as type (13) Changed Data Value with a primaryAttributeValueID of (80) Unsubscribed.
How do we make Activity Type (9) Unsubscribe Email happen? We want to make sure we cover all of our basis when dealing with unsubscribes.
Thank you in advance for any information on this topic.