I try to express myself in as much detail as possible. I have Fortnite on the switch and on the PC. I just want to play on the PC. When I log in I get into an account where there's no progress. Can I transfer my account? I think it helps if I know the login data from my Fortnite on the switch. How can I find out. If you answer with a question please wait until I have answered it and then help me. I really need help. (spent more than 100 euro)
Log in to Epic with your switch (Nintendo Account), then deposit your email and create an Epic account. If you have done everything exactly like this, you can log on to the PC and should have transferred your account.
As far as I know, you can use the switch account. Link to an Epic Games account. Can't explain that well here. Best look fu at YT:
Link switch account to Epicgames account