Originally Posted by
The Lev
I'm assuming this new partially working feature will not allow me to change a seat on AC metal that is booked as a LX codeshare.
Codeshares are typically not working properly when it comes to seatmaps, however UA & LH codeshares have worked for me via the Lufthansa.com website in the recent past.
If you have an Amadeus record locator you could try to access your booking on lufthansa.com and see if the seat selection works.