I'm new to USAir (and returning to AA after my UA divorce)

I'm flying tomorrow on a USAir flight booked on AA and trying to check in. I can get a pdf on my laptop. But cannot for the life of me figure out how to get a mobile boarding pass. I've loaded both the AA and US app, and I can check in on the US app, and it says I'm checked in but have no boarding pass!

Help from the experts please!