Fortnite (sorry!)

[wordsareveryunnecessary]

DS has 2 Fortnite accounts. The main one he uses on the playstation.
The other Fortnite account was used on mobile. How can we use two different Fortntie accounts on the playstation? he spent a fair amount on it and wants to be able to use it again.
I can't fathom out how to do this.
(Sorry it's in aibu)

You might be to able to merge the two accounts into one on the Epic Games site so he can use the same account on different devices.
If not, make another PlayStation account and link the phone account to that through Epic Games.
Hope it works!

Account merging is no longer possible.
I don't know how to set up another playstation account on the PS4? Do I create a new user?

Ahh I didn't know you couldn't merge anymore.
I would make an Epic account if you haven't already, link it to the phone account then create new user on the PS4 and log in through your Epic account. Been a while since I done it for my daughter.
www.epicgames.com/help/en-US/epic-accounts-c74/connect-accounts-c110/how-do-i-link-my-console-account-to-my-epic-games-account-using-the-web-a3669

www.epicgames.com/help/en-US/epic-accounts-c74/connect-accounts-c110/how-do-i-link-my-console-account-to-my-epic-games-account-using-my-console-a3668

I hope that helps. I remember it took me ages but we got it eventually.

I have a second playstation user set up.
I think I need to create a new Playstation account and pay for a second subscription for this user or I won't be able to play with the different Fortnite account?