According to a Reddit post by an Epic representative, the downtime occurred due to a “critical failure with one of [the] account service databases.”
Players could reconnect to Fornite at around 5.00 am AEST this morning.
The Battle Bus once again operational! Hop in and hop on :) ??
— Fortnite (@FortniteGame) April 12, 2018
It’s possible the error was exacerbated by Fortnite‘s 3.5 update, which was also made available yesterday.
Whatever happened, Fortnite and Fortnite: Battle Royale are back up and running — just without the Guided Missile, that is. Jump back in and have fun!
Fortnite: Battle Royale is available on Windows PC, Xbox One, PS4 and iOS.