Fortnite Server Status | Is Fortnite Down Right Now?
Sometimes you’ll get bouts of unplayable lag while you’re in game, which has you wondering if the servers are going through some trouble, making it hard to win Fortnite games. And that’s if you’re even able to log in.
If you’re experiencing difficulties logging into the game or got disconnected during a round or match, it could be caused by a server outage.

Source | Epic Games
Find out if it’s a connection issue
First thing to know when checking for server issues is to make sure its not that you’re having connection problems. On the PC side of things, this could be checking for a Windows update, and/or making sure that Fortnite doesn’t have any missed updates in your Epic Games Launcher.
Updating Windows can solve many problems that you may have with the game, including installation, connection, and launch issues. This can also improve your PC’s overall performance.
For console players, if the game and console are showing no updates and there’s no reported outages, you may need to reinstall your game.
How can I check Fortnite server status?

Source | Fortnite Wiki – Fandom