For me on flights both last week and this week, the app wouldn't display the boarding pass within it but there was something that I clicked on with opened up a boarding pass on Safari and I was able to add it in to my apple wallet that way.

Also, considering the extra screen size of an iPad, why does the iPad version seem more cutdown than the iPhone one? And running the iPhone version on the iPad it complains when you first open it that it's not the right one, despite the "right one" having less features!