Originally Posted by
cbourl
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

I have sympathy. It's pathetic that these problems arose in the first place and even more that they are not solved quickly. For instance, with my seat reservation that I first could not make or then change. Now it's dropped out for the second time and I could not reenter it. I called and was told it's because of a error in the "seat purchase transaction", even though it should be a no-cost transaction.
According to the agent, at time of seat reservation, the system expects to get more money (no surprise, right?). But when the amount is 0€, there is no purchase transaction. So, after a few days, the system thinks that I didn't pay my 0€ and throws out the seat.
It's sounds plausible, but at the same time absolutely insane for a :-::-::-::-::-: airline in the 21st century. Alas, a yet another reason LH is not :-::-::-::-::-: in my book.
Agent told me he's now done something to let the system believe that a payment took place. I have 62% faith in it.