Issue Description
When a lead fills out the form in Marketo, Marketo sync fails with an error "Duplicates_Detected."
Issue Resolution
This error, "Failed: DUPLICATES_DETECTED: Use one of these records?" is a message Salesforce is sending back to Marketo, rejecting the attempt to sync the record. This means there's a setting in SFDC preventing duplicates from being created, possibly due to a custom deduplication rule on the SFDC side.
Recommended steps : Check the dedupe settings and check for these leads in SFDC based on the things other than the email address like first name, last name etc. You may need to work with your SFDC admin to determine why Salesforce rejecting the record as duplicate.
Who This Solution Applies To
Customers integrated with Salesforce
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