Generally speaking, development for any console is not so easy as development for PC or mobile. Usually you need to be registered as developer (and sign NDAs) even to have access for appropriate SDKs or development kits (hardware) to develop and test your idea.
Microsoft XBox is one exception to this rule, due to Universal Windows Platform (UWP). This means developing an application or game that runs on both Windows PC and XBox. So, you can develop and test you game on normal XBox (no special hardware needed, and only a very simple developer registration), but in order to publish it for XBox you have to register as publisher (with normal paperwork etc.)
Two useful starting points for Unreal Engine UWP development are:
However, be prepared to compile a special UWP version of Unreal Engine from source.
Unreal Engine Pathways 