Question

How to map "Interested Users" in a New Order import profile, as part of creating a new POL (PO Line)?

Answer

Use any unique Identifier such as the Primary ID, barcode or also email, if the email was configured and loaded to the user record as as an identifier.

This value must be synchronized between the vendor and your institution.  Value is case sensitive. To reiterate, the email, if used as identifier, should be stored in the Alma "Identifiers" tab of the user record, even if already added to the user's Contact information.