Confused.
a few month back I booked a revenue ticket on UA that included a DFW-FRA-TLV legs on LH.
upon completion of booking I got exit row seat assignments on both LH flights.

Booked the same exact ticket today again.
This time, no seats have been assigned, and if I go to LH and enter my confirmation if asks me to pay for seating.

It’s mapped as an S class.

Don’t really understand it…

insights?

thanks
R