That requires you to build your game for UWP (Universal Windows Platform) which Epic does not support with UE4. Microsoft has a branch of UE4 that they’ve added UWP support for, but note that using UWP has disadvantages over using the native Xbox One support that Epic has implemented if you become a part of the official developer program. However, to get that version of UE4 you have to be accepted into the program by Microsoft so you have to prove that your game is a worthwhile project.