Alan_Kong

Per response from Marketo support, they will create a duplicate even if the REST API is properly implemented because regardless of what you think, the email address is still part of the equation on uniqueness especially when the email address has no value.

I agree with Sherry and Greg. This needs to be a top priority if not already implemented.We maintained a data mart of lead data for uploading to Marketo using a unique identifier (Lead_UID). The email content for these lead can have value or not over time (customer decide to opt out). Because ...