Abstract: The field of the invention relates to network connected authentication systems, and more particularly to systems and methods that enable authentication of a user using a connected device in the possession of the user. In an embodiment, the system includes a network connected authentication server system communicatively coupled to a network for access by a plurality of user devices to authenticate a plurality of users of one or more third party applications, and a user account database coupled to the network connected authentication server system to store account information including a username for each of the plurality of users.