"Print Itinerary" under View Current Reservation does not show the United confirmation number on a mixed CO/UA itin.

E-mailed itinerary and receipt confirmation shows the seat number on the UA segment as "--", but the correct seat number does appear on the View Current Reservation screen, and on ua.com

"Upgrade Reservation" blows up with an error message when I try to redeem miles to upgrade my outbound journey (CO metal) on the mixed CO/UA itin.

Edit: Called Elite Desk (got through in 2 mins, BTW) and was told no availability for the upgrade so perhaps that's why the error? So she manually waitlisted me. Would be nice if the website did that automatically instead of showing a generic error message and requiring a phone call...