Sony has finally done what many Fortnite gamers have been asking for since the game launched, enabling cross-play support between the PS4 and other platforms. Starting today, a beta version of the game is being released which enables Fortnite players on PS4 to play against those on Xbox One, Nintendo Switch, PC/Mac, iOS and Android. Users will also be able to sync their progress and purchases. Until now, PS4 cross-play for Fortnite only worked with PC/Mac and the mobile versions but not with other consoles. Sony had previously come up with numerous excuses as to why this did not...
Source: https://www.gsmarena.com/sony_enables_fortnite_crossplay_between_ps4_xbox_one_and_switch-news-33471.php