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.