We have a lot of leads/contacts in SFDC that are NOT synced to Marketo. We have a custom Sync Rule -> in order for any SFDC lead/contact to sync to Marketo, they need a true/false box "Sync" to equal TRUE.
Some of our leads/contacts in SFDC have records in Marketo that are not Synced (e.g. John Smith exists in SFDC with Sync = FALSE; then, John Smith gets added to Marketo as a separate record). When we click SFDC-John's checkbox to TRUE, he gets added as a duplicate to Marketo (so now there are two John Smith's in Marketo). Is there a way to avoid this and sync the two records together, rather than create these duplicates?