Now that Fortnite is back on iOS with Apple's approval of the game, Microsoft is jumping in to try to extend its ability to sell games on the platform through its Xbox app.Microsoft on Tuesday filed an amicus brief in district court in support of Fortnite publisher Epic Games saying that Apple has "stymied" its efforts to sell games through its mobile Xbox app on iOS.

Nearly five years after Apple unceremoniously kicked Fortnite off the App Store, the immensely popular battle royale shooter is back on iPhones and iPads.

Fortnite launched in 2017 and became an instant hit, drawing millions of players around the world thanks to its last-player-standing, “battle royale” format.