Smart, forgot about that. Doesn't help. It's specifically the Premium Economy part that's breaking it. I can search my multi-city in economy, including the partner segment, prices out same as United.com and all marketed by UA. When I change it to Premium, that's where all United marketed options disappear and it all becomes LH, even if I split the intra Europe flight. I can do all UA changing the starting point of the return to the second euro city, but then the fare just goes up quite a bit. Will keep trying to get creative and call Chase if needed.