UA connection to Air Dolomiti - unable to book
Looking at flights US-Italy with various connections possible. Most attractive involves Air Dolomiti (via MUC) but get error message when trying to purchase. Web support tells me that UA's connection with Air Dolomiti doesn't recognize seats or something and that Air Dolomiti doesn't have seats on the flight. Of course, the Air Dolomiti site shows seats available (as well as on later flight, which also wasn't bookable).
Any fixes or tricks? Or just move on and book a different connection?