I can no longer play Fortnite with friends on my iPad?

I always see I'm not up to date but have made all the updates and when I go to the Apps Store, fortnite is not even displayed on me

Fortnite was removed from the app store following a dispute between Apple and Epic Games. It is probably because of that.

Fortnite is still in the AppStore, but is unsolved. You can still see and download it in Purchases. If there's crossplay, it will probably not be due to the servers