Hi, I'm trying to book two tickets to Italy for my wife and I in March using miles. The website shows no saver availability on UA, but pretty decent availability on LH and/or SR. However, whenever I try to book a ticket, I get all the way through the booking and get the dreaded "We’re sorry, but united.com was unable to complete your request. Please try later or contact united.com Support in the U.S. and Canada at 1-800-396-1751; the U.K. at 0800 028 5003; elsewhere use the local phone number" message.

I've tried calling the Premier Exec line twice. The first rep was very unhelpful, and simply said "there's no availability on partner airlines, you must have done something wrong." The second rep was the opposite -- tried multiple options with me, all of which show up as available for saver fares on my screen, but not hers.

Any idea what is going on? Any tips for how to actually get these tix, which appear available? Or is their availability system for partners just totally FUBAR? Thanks......