How to make the touch ID work on my IPhone for my bank app?

The touch ID had been working for months but stopped the other day. It is not working for the sites i use the touch ID on my IPhone. I have tried to go into my settings but can't find the answer. My finger print is still stored in the phone.

Try things like gently cleaning the button, turning Touch ID off and on, rebooting the phone, deleting the old fingerprints (swipe left on them) and re-training it, see what happens. If that doesn't do anything, you'll need to take it in.