Historically, it is fairly common to find BR J class award when search via UA award calendar... but recently, there has been nearly zero availability for BR business class award on United calendar even two weeks prior to departure....

So EVA has restricted its business class award to partner?

To be honest, I don't even see much availability either by search BR website, which is extremely painful to use... I have no idea why these Asian carriers' websites are so difficult to navigate (not just EVA)....