When attempting to bulk CSV load a user property that is of List/Array type, the csv importer fails to work despite following the format recommended by the documentation : https://help.klaviyo.com/hc/en-us/articles/115005237648-About-Data-Types#list6
For example the very simple CSV below fails with “column missing” but if I change the property to be a normal string, the upload completes. It looks like the CSV uploader does not actually support List data types despite the documentation.
Email,some_property
vim@gmail.com,l"A","B"]