https://www.gamespot.com/articles/fortnites-playground-mode-is-down-but-set-to-come-/1100-6460056/

Update 2: Epic has provided another update on the status of Fortnite: Battle Royale's new Playground mode. In another Reddit post, it stated, "Yesterday we launched the Playground LTM. So many of you rushed in to create and play that our matchmaking service fell over. We've since separated the Playground matchmaker from the one that affects the default modes and made large improvements to assist with the number of players. We plan to push these changes and improvements live later today to bring the Playground LTM back online. We'll give you more updates and a timeline as soon as we have one."

We'll report back as more details are shared, but that means we can expect to get into Playground mode today, June 28, presumably during US time. For now, you can check out the new Week 9 challenges that are now live.