If Roblox Marketplace is not working or loading and you see If you are having trouble loading Marketplace message, then see this post.

Check your iPad’s RAM here. While the iPad 9 remains perfectly suitable for FaceTime, video playback, and less graphics-intensive games, it can’t run Fortnite and struggles with Roblox.

Roblox outages have peaked at around 11am and have been slowly decreasing since. However, some fans are still complaining online that they're struggling to load the game.