Fortnite duos mod with 2 controllers?

Hi, I wanted to ask if you can play on Xbox one, in fortnite duos with 2 controllers on 1 xbox and if so how do you do that from the beginning?

Fortnite is generally a single player game

Nevertheless, you can play with others

My friend has an Xbox one with 2 controllers and we would like to play together, but we don't know how

If you have 2 Xboxes it works like this: Connect to two different TVs, accept each other as friends and then you can simply join the group at fortnite

if you only have one xbox then you can't do that with 2 controllers.