https://www.techradar.com/news/the-return-of-fortnites-playground-mode-gets-delayed-again

Epic Games has managed to push Fortnite to mobile phones and the Nintendo Switch but it hasn't yet been able to roll out Playground Mode. The practice mode for learning the Fortnite ropes has now officially been delayed until next week at least.

According to the Fortnite Twitter account, the LTM (Limited Time Mode) isn't yet ready for public consumption, though we don't really have any more details than that. The root of the problem seems to be the matchmaking system, which is why Playground Mode got pulled hours after launch earlier this week.