From my understanding of the integration, unsubscribe is the main 2-way sync, but such a 2-way connection must be explicitly approved to begin with. For more info regarding the Salesforce integration, I'd advise reading over our main article on the subject. Beyond that, if you're needing more advanced insight or troubleshooting, I'd advise calling our general support and requesting a transfer to the Tier 2 integrations support team, since they're explicitly trained for handling these integrations.
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