How do I get my ps4 fortnite acc on the switch?

I want to get my ps4 fortnite acc on the switch. I'm now ready to enter the email and password on the switch. There are 2 acc on the ps4 and a fortnite acc on both. Do I have to register the information from fortnite or from the ps4 because the information from the ps4 to the 2nd acc somehow does not work

Very easily:

Go to https://www.epicgames.com/...te/de/home

Create an account there.

Go to https://www.epicgames.com/.../connected and log in with your previously created Acc.

Then you are on the connection page. Connect both Playsation Network and Nintendo switch and leave both accounts connected