I recently saw this error message. I don't quite understand what this means. Doesn't Marketo update Contact/Lead if it finds there's an existing Contact or Lead record?
Failed: UNKNOWN_EXCEPTION: You may be creating a lead where a contact and account already exist. We recommend you use an existing record instead.
I tried to determine what caused the fail. The only thing I can think of was we created a different record type for Partners and this Contact was happened to be a Partner. Would Marketo update contact record for different Account Record Type? Or is this error message telling something else?