Originally Posted by
athome
Is your ticket already issued? If not, that's the reason. Seat selection works only during online booking or after ticket is issued.
Ticket issued can assign seats on Swiss.com for LX flights
LH.com does not show any option for seat assignment Call centre in US cant assign Senator preferred seats in C DE Senator call centre can
Why is lH.com still broken?
Interestingly a separate booking with UAmiles TLV-ZRH-MXP allows seating assignment on LH.com and all flights are on LX! Go figure