I created a mirror material but the reflection shows non existing world

I created own mirror material which I placed on a wall n expected to reflect the map and player etc. It instead shows me a bunch of mountains, sky, land etc. Is reflection in fortnite not possible/fake?

If a mirror asset already exists on uefn let me know also

Assuming you’re not using raytraced reflections you might need to add a reflection capture probe to the scene?