This is the login portal for individuals who have setup a username and password. You are now one of those individuals. You will no longer need an access code to login. If you are trying to login and it is prompting you for an access code or to create an account, do not create a new account or attempt to use your email address to login.
Simply check the URL and make sure you are on this page:
https://work.workplace.com/work/company_selector/