Hi all. I have one world Ruby through my JAL status (Crystal). I have booked a flight from MAD-LHR, and booked this through the BA we site and it has a BA flight number. However it says it's operated by Iberia and I have confirmed this through the Iberia app (the flight shows on my profile).

However when I try to choose a seat for this flight it comes up as 13/26 euros. My JAL number is attached to the booking. How can I get this to properly reflect my status so I can get a seat (preferably emergency) without needing to pay? Or am I misunderstanding something?

Thanks!