Full Crossplay Support Comes to PS4 Starting With 'Fortnite

The open beta allows crossplay, progression, and commerce across the PS4, Android, iOS, Nintendo Switch, Xbox One, PC, and Mac platforms. 

PlayStation 4 Finally Gets Crossplay With Xbox One/Switch, Fortnite First Game Supported

Paladins Switch And PS4 Cross-Play Now Available, Support For Realm Royale And Smite Coming Soon – NintendoSoup

Fortnite: Save the World - Wikipedia

PS4 Cross-Play Confirmed; Fortnite Beta Is Live - GameSpot

Why Fortnite Accounts on PlayStation 4 Won't Work on Nintendo Switch

Dauntless Becomes First Game To Launch With PS4 Cross-Play - IGN

Fortnite won't support cross-play between Nintendo Switch and PS4

Why cross-play matters - Epic Online Services

Sony's PS4 cross-play stance softens, giving Fortnite fans hope

When is Fortnite Android going to be released, will it be on Google Play and does it have crossplay with PS4, Switch or Xbox One?

Fortnite gets PS4-Xbox One crossplay due to configuration issue

Full Crossplay Support Comes to PS4 Starting With 'Fortnite

Fortnite for Windows PC will soon pick up cross-play with PS4, phones but not Xbox (Updated)