https://techcrunch.com/2018/06/12/fortnite-wont-support-cross-play-between-nintendo-switch-and-ps4/

As rumored, Fornite is coming to the Nintendo Switch. In fact, it’s arriving even earlier than we imagined, available today as a free download from the Nintendo eShop. The addition widens the play field for the title’s wildly popular gameplay. The Epic game is currently available on PC, Xbox One, PlayStation 4 and iOS, in addition to the new Nintendo console.

And while cross-platform play has been the key to the battle royale mode, Sony’s long been a bit of a stick in the mud on this one. The Xbox One version, for instance, can be played with PC and iOS. Ditto for the PS4 version. But Xbox One and PS4 cross-play is a non-starter.