Touch ID stopped after battery replacement
This might be helpful to someone else: I took my iPhone 7 to the genius bar to get a battery replacement. Battery was replaced, but then I discovered the touch id would not work at all. I called the store, and they made another genius bar appt. I went back and was told that there was nothing wrong with the phone, but they could replace the home button for $58. I was polite but firm, that this happened as a result of the battery replacement. Long story short, after resetting the phone and touch ID would still not work, they replaced the display and now it works. If you get your battery replaced, make sure touch ID works.
iPhone 7