While two-factor authentictaion is not new to the PlayStation Network, today the official Ask PlayStation Japanese Twitter account recommended the verification progress be used for logging in.
Sony provided a screenshot of the two-factor sign-up page as well as a link for more information. (You can read the English version of the page right here.)
Sony confirmed that the PlayStation Network was getting two-factor back in 2016 and rolled the feature out to users. Microsoft, however, had already launched the extra security step back in 2013.