Sorry, I've got access through my cable subscription - don't have ESPN+, which is a stand alone service.
What you want is WatchESPN:
http://www.espn.com/watchAnd this is what you need:
Simulcasts of the ESPN channels available on the WatchESPN app and website (including ESPN Goal Line and ESPN Buzzer Beater) are only available to subscribers of pay television providers AT&T U-verse, Bright House Networks, Cablevision, Charter Communications, Cox Communications, Dish Network (including subsidiary Sling TV), Google Fiber, Grande Communications, Midcontinent Communications, Time Warner Cable, Verizon FiOS and Xfinity TV (formerly Comcast Digital Cable); Atlantic Broadband is set to begin allowing access to the service for its customers by the end of 2014. In 2015, as part of a new agreement with The Walt Disney Company, DirecTV (the largest holdout among major pay TV providers) added authentication rights to WatchESPN for its subscribers.
The two major IPTV providers,
Sling TV and PlayStation Vue, also offer authentication to WatchESPN; the two services, however, offer the same feeds of the ESPN networks that are carried on the WatchESPN platform (including with selected advertisements replaced by the "We'll Back Right Back" message and black screen), as opposed as the cable/satellite versions of each respective ESPN channel.