t-29h: Seats

I just talked to LH for a final check of tickets. Everything seems to be alright in terms of Gina being booked, excess baggage being booked, tickets are available. But:

My flight ticket have been booked in February and then rebooked to today. P.'s ticket has been booked using my miles and therefore is a completely different, unrelated flight ticket. Gina and excess baggage are flying with me. P. just got her flight ticket. In context of seating P. is restricted to seat rows 19 and 20 and cannot be seated anywhere else (due to booking the flight with miles there is a restriction in seating).

Trying to check-in the flights results in P.'s check-in proceeding as normal, whereas mine does not:

So there is no way to proceed with my check-in online. They are asking me to do the check-in at the check-in counter, because they want to provide "special assistance" due to the "special services (e.g. pet..." I booked. Hence, I will be seated somewhere on this plane (not in rows 19 or 20) together with Gina and P. is gonna be seated in her rows 19 or 20. Generally not a big deal, but

1. Gina does have the aforementioned tendency to keep her pack together and she is really nervous, when we are separated
2. Gina would generally be calmer, if she knew that P. was there as well.
3. It would have been way easier to deal with the dog aboard the plane with two people rather than alone.

So yay! I appreciate your "special assistance", but I just want to sit next to my girlfriend, which apparently is not possible.

LH Service Center guys suggested to call LH Ezeiza Office guys to clarify. LH Ezeiza Office guys should have been avaiable between 7am and 4.30pm. But they were not.

So we will see, if we will be able to clarify these things tomorrow at the check-in counter... or if we will actually have to ask people aboard the plane to change seats with us...