what i need is to update my list. So I need to import my csv and update some fields... But my new csv file has all the email fields empty. So I need to have another lookup field. Is this possible?
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I don’t think this is something that is possible via UI/List Import wizard. You could reach out to support to change your de-duplication rule but I don’t think that’s what it is needed here for importing this 1 list w/o email addresses specifically. I’m afraid you’d have to do some grunt work to add email addresses to your CSV file and then do a list import. Alternatively, you could also use leads API endpoint to update people using lead-id/custom field as de-duplication field.
What field are you trying to use, exactly? Not all fields are available as lookup keys, even if you use the API.