Well yes it's an app issue, unless I am misunderstanding a nuance in what you say. But it is an issue that UA can overcome. AV reward tickets on UA, no log in, saved to the home screen, works just fine. All airlines are able to access their own reservations and I'd happily download all of them and stick them in a folder if only they'd save the PNR without a log in. So long as I have to reenter my PNR and surname, it's too clunky to be of much any use.