Reports via Twitter started appearing around 12 pm GMT on 6th April, with players reporting receiving an "Invalid Client" error when attempting to login.
Epic confirmed the issues at 1:30 pm and later, at 4:30 pm, added that the Epic Games Launcher and Fortnite servers were still "degraded".
Players are also reporting issues with their friends' list, with other players not appearing even when they are online.
As informed by the developers, the services should be up soon, and players should have regular access to these applications soon.
We will update this page with any news as we get it.