Among the many announcements in Nintendo’s E3 2018 Direct, Nintendo and Epic Games announced the launch of Fortnite on Nintendo Switch with cross-play that very day.
The Swtich version offers cross-platform play and cross-platform progression with Xbox One, PC, Mac, and mobile devices. However, as players soon learned, Epic Games accounts linked to Fortnite on PS4 cannot carry over to the Switch version of Epic’s popular battle royale title.
Source: IGN.com Nintendo on Importance of Cross-Platform Play