Originally Posted by flyerCO

Unused ticket already will show up. I think OP thinks "ecredit" is a thing in and of itself. (Instead of simply as as heading encompassing unused tickets and DL CS vouchers) They might also think being called an ecredit means can be used by anyone. Again, it's just a heading. The terms of the voucher determines if can be used by anyone or just person named. (Unused etickets can always only be used by person named)

Also possible that agent doesn't understand an unused eticket is an "ecredit."

Regardless the paid passenger when using companion certificate must be the one whose name the unused eticket is in. The fees/taxes for the free companion will need be paid for with cash, an unused eticket in their name or a voucher usable by anyone.