I've had the same issue with the PayPal app. Been going on for about 2 months. It will prompt me for my fingerprint when I first go to log in, but once I give it and it is recognized, it still asks for password. Then, after password, it asks if I'd like to enable fingerprint access. I've tried reinstall, clearing the cache, redoing my fingerprints, changing security settings. Nothing works. Very annoying as I need to use the app about 10 times per day.