I've dove through a number of related threads in this group and seen a couple work arounds for this scenario. Particularly Dan Stevens. seems to have listed the most thorough work around on this thread:Re: Lead Process Updating . Is there really no way to disable this Dynamics duplicate check and rely on Marketo's native dedupe ability? Is there not a way to remove the duplication rules from applying to your Marketo sync user?
Any insight you have would be much appreciated!