https://www.gamespot.com/articles/fortnite-playground-mode-delayed-update-coming-tod/1100-6460056/

Update 5: Playground mode will not launch in Fortnite this week after all. Epic announced that it now won't launch until next week, with additional details to be shared on Monday, July 2. In a tweet, it said, "We're still unable to resolve issues preventing the launch of the Playground LTM. We are holding the release until next week to continue hammering away this weekend. We're sorry we haven't been able to get you in the LTM, and we know waiting is the worst."

Update 4: Fortnite's Playground mode is still unavailable a day after it was set to return. Epic says progress is being made but it's trying to avoid rushing into pushing it up. "We're continuing testing on our matchmaking improvements and are still aiming to open the Playground LTM as soon as we're confident in our improvements," it said on Reddit. "Once we have confirmed that our testing was successful we will begin gradually rolling servers out to all regions and platforms until it's available to all players."