https://www.gamespot.com/articles/fortnite-server-issues-impacting-matchmaking-login/1100-6457403/

Although we're not getting the new Fortnite content that was expected today, some players are having trouble even playing the existing game. Epic has confirmed that some server issues have come up, though we don't know how soon they might be fixed. [Update: Epic now says the problems have been resolved, so you should have no problem jumping in. There's no word yet on when patch 3.3 will be released.]