SFO-ORD-MUC-MRS.

All on UA metal except the last one on LH.

The Boarding Pass tab says "No Boarding passes" and has a "Flight Check-in" button.

Tap it and it allows me to tap the reservation.

Then in the "Reservation Details" window, it shows each segment and at the bottom has a yellow "Reprint Boarding Passes" button.

Tap that button and it offers to Email Boarding Passes (for printing). I guess it doesn't support AirPrint.

No other option for Boarding Pass Delivery.