Fortnite account merge?

I just wanted to merge my account in Fortnite (PC account and PS4 account) when I had entered everything and had verified everything, etc. Came the message that it seems the * same account * is what is not true. (The accounts are also not connected so PC with PS4)

Is still an Epicgames account connected to the PS4?

So the PC acc is connected to a PS4 acc

and

but not the same accs

I think then the problem is that you can't merge accounts of the same platform… I think so