https://www.gamespot.com/articles/fortnite-new-50v50-modes-release-delayed/1100-6458157/

Update: Fortnite developer Epic has postponed the start of Battle Royale's new limited-time mode, 50v50 v2, to next week. In a post on Reddit, the developer announced, "You may have seen information or even a video about the 50v50 v2 Limited Time Mode going live today. Due to the account service issues we've been experiencing, and in order to preserve your play experience this weekend, we will be delaying it to next week." This delay comes after Fortnite experienced a significant bout of downtime that lasted nearly a day. The original story follows.

A new limited-time mode is starting soon in Fortnite: Battle Royale. Following the release of the game's 3.5 update on PS4, Xbox One, PC, and mobile, Epic is planning to kick off the 50v50 v2 event, a modified version of the game's very first limited-time mode.