Epic does not allow Fortnite on Xbox Cloud Streaming

Enable Cloud Saves in the Epic Games Launcher - Epic Games Store Support

Sorry Apple, but Fortnite is back on the iPhone & iPad - Tech Advisor

Free Fortnite FAQ - Epic Games

Fortnite Now Free on iPhone With Xbox Cloud Gaming

Google Countersues Epic Games Over Fortnite's In-Game Payments

Fortnite

You can't play Fortnite on Microsoft's xCloud because Epic wouldn't allow it

Fortnite' is back on iOS for free via Xbox Cloud Gaming

Xbox Cloud Gaming iOS: how to download, play Fortnite, and everything you need to know - Mirror Online

How to Play Fortnite on Xbox Cloud Gaming