I linked a PS4 from my mother to my Epic account for Fortnite. Now I also have a PS4 with my father and can't link it because it says I'm already registered on the Playstation Network. Does anyone know how I can play the same account on both?
You can only link an Epic Games account to a respective PsN account.
So you have to log in on the other Ps4 with the same account as on your Ps4