I found a bug that would require a platform fix affecting multiple customers. Support is maintaining that this will not be fixed without evaluation from the community and product managers.
How the Error Manifests
If an instance has implemented a sync filter, either via SFDC sharing rules or via a Marketo Field Sync filter, errors can occur in Marketo when merging records in SFDC. The error occurs when the master record in SFDC is not synchronized to Marketo.
The following behavior occurs afterwards:
The only way to resolve the duplicates, is to manually merge the records in Marketo by going through every lead/person that's been marked as deleted. This method also assumes that the 'sync to marketo' flag was properly updated on the master record. If it wasn't, then the record in SFDC has to be restored and the previous master record must be updated to be synchronized to marketo. Only then, can the two records be merged correctly in marketo without error and updated to have the correct SFDC Ids.
Also, I had a separate case logged where I discovered if the original record with the error is left for too long in Marketo, the only action that can be taken is to delete the record and thus delete the prior history.
It is not possible to run a report on synchronization errors with the current SFDC sync product, but there is an idea posted for it: Sync Error tab for the SFDC connector
Requested Resolution Possibilities
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