Need help connecting my Epic and Nintendo accounts

Hi Guys, I really need your help. Trying to get the switch set up but it won’t let me log in. It’s my own fault but What I’ve done is put the wrong Nintendo Account into epic account and now I can’t delete the bugger. What am I doing wrong?
If you have your Epic account tied into your PS4 Fortnite account that wont work, you'll need to create a new one. From what I understand its cause there is no cross play between Sony and Nintendo so your current account wont carry over. Had to figure this out last night myself for 20 minutes.