Can't Link Nintendo Account to Epic Games Account

Ok, so basically, I have an old 2016-2018 Rocket league account on my switch. I have tried to link my epic games account and my switch account. Yet, I cannot because it keeps giving me an error message. It always say that I have already connected it to a different epic account. I don't understand why as I have revoked all permissions from my Nintendo account on the official website. Can anyone help me solve this problem? I have some OG cars on this account and would really like to put it on my main account.

I will attach a screenshot of the error message

https://preview.redd.it/nvwubgk3j5pe1.png?width=1917&format=png&auto=webp&s=514d98c39a2e460b665d899941ec05dc71e0b1c8