Originally Posted by
goodeats21
This might not work for award flights.
I have revenue reservation with partner airlines and the link WinecountryUA mentions is present. On award reservation with partner airlines, the link is not there.
You will probably have better luck just calling LH. With your name and flight details, they have always been able to find the reservation and assign seats.
It should be there as long as your itinerary includes at least one United segment. Alternatively you can just call United and ask them for the LH record locator or next time remember to ask for it during booking.