https://www.theverge.com/2018/9/26/17905146/sony-fortnite-ps4-cross-play-support

Sony is finally enabling cross-play for Fortnite today. The PlayStation 4 maker had been blocking cross-play and progression between Fortnite on PS4 and Nintendo Switch / Xbox One in recent months. The move angered Fortnite fans who couldn’t access progress, skins, and purchases on and Xbox One or Nintendo Switch if they’d played on a PS4. Sony now says it is enabling cross-play for Fortnite fans.

“We recognize that PS4 players have been eagerly awaiting an update, and we appreciate the community’s continued patience as we have navigated through this issue to find a solution,” says Sony’s PlayStation chief, John Kodera. “The first step will be an open beta beginning today for Fortnite that will allow for cross platform gameplay, progression and commerce across PlayStation 4, Android, iOS, Nintendo Switch, Xbox One, Microsoft Windows, and Mac operating systems.”