UA connecting at FRA to LH
Flying from SFO-FRA in bus class then connection to a Lufthansa flight to Rome in coach.
LH says no seat assignments until check-in.
Do I get my LH boarding passes when I check-in at SFO for my UA flight?
Or do I have to find the LH check-in desk upon arrival at FRA.
I did this once before EWR-FRA-FCO on CO in BF, last time I already had the boarding passes before I arrived in FRA.