MacBook Touch ID Not Working?

Has this ever happened to you? You try to use your Touch ID to login to your MacBook Pro or MacBook Air and it does not work. My wife has a MacBook Air with Touch ID, this has never happened to her, but I understand it has been a problem for some people. This article describes ways to fix this issue. Even if you are not having this problem, but you do have a Touch ID device, it would be a good idea to read the article for future reference.