Touch ID doesn't work on MacBook Air 2
I have a new MacBook Air. After a few months, the Touch ID has stopped working. I have tried shutting down and restarting the computer; and I have tried resetting the ID many times, using different fingers. It still doesn't respond.
(I have been to my local Genius Bar. It was they that recommended the rebooting and resetting I mentioned above. So, no help there.)
MacBook Air 11″, macOS 10.12