Mobile Safari Bug

I was checking out an old video I had posted on Youtube of an ROBLOX tutorial, click the link to go to the place it was showcasing and when I clicked play you get this error message! Something that should not be hard to fix but It would be convenient for new users or people who have not heard of ROBLOX to be linked to the App Store App. If I remember correctly it works if you actually have the ROBLOX app. Didn’t try it though as I don’t have the app anymore.