Ahh yes it is shown on its own pane on the Joomla user profile called "Two step verification" - it is not shown on the login module, as you first have to enter your username and password as usual and the the verification code box is shown afterwards - so it works a bit different than the two-factor verification - it is actually a bit more intuitive. It actually also works when loggin in with the CB module - it is just not shown on the CB prolfile. Would be really nice if it was integrated - I think a lot of people would like to use eg the SMS ability of this extension.