Hi,

I’m reviving this thread since I have the opposite problem.
Trying to leverage an Amex offer with AF/KL by booking JFK>LHR and then KEF>JFK in basic economy this August.

I’m seeing a very attractive fare for that routing, coded either as KL or AF on Google flights, Kayak, ITA matrix and Expert Flyer.
DL and VS websites let me go through to the booking page, so do third party OTA (on 057 stock), but not AF or KL. I either get a glitch and get sent back to the search page or KL will only show me the standard fare.

On a previous booking I had managed to get around that by going through Kayak but it’s not working this time. I’ve tried calling twice but the pricing they give me for light is higher than what I see for standard online.

I’m considering going all the way until payment on the KL website (getting the PNR but not paying for it) and calling to see if they can manually downgrade to light over the phone, but I doubt it will work.

I’m running out of ideas and wondering if anyone has found a way around this IT issue for multi city bookings before. Thanks in advance