Epic games keeps saying my account already exists but I can't sign in? What sup?

You should contact Epic games if you have sign in issues with their log in.
https://www.epicgames.com/help/en-US/

The problem is, it will not let me lick my PS4 to my epic account keeps saying sorry, but this account for PlayStation network has already been associated with another epic games account

Hi TattyATcool,

I found a link that may help you. http://fortnitehelp.epicgames.com/customer/en/portal/articles/2915240-when-i-try-to-link-my-psn-xbl-account-to-my-epic-account-it-says-that-my-psn-xbl-account-is-already-linked-to-an-epic-account-

This usually indicates that your PSN or Xbox account is linked to a "blank" Epic account, which can occur when you play on PS4 or Xbox One without linking an Epic account. This can be corrected by promoting the "blank" account to a full-fledged Epic account. In order to do so, please complete the following steps:

Visit the Fortnite Website.
If you're already logged into an account, sign out
At the top right-hand corner there will be a icon of a silhouette – Mouse over this icon and select Playstation or Xbox
Log in using your PSN or Xbox Live credentials.
Make sure NOT to login with any existing Epic Games Account information. You are trying to promote your existing "blank" Epic Account.
Once logged in, you will be asked to Register. In order to link the account, you will need to use an Email Address and Display Name that are NOT being used on another Epic account.
If you are receiving an error message saying that you're account is already linked during this process, you are most likely trying to use an email address or display name that are already in use
Bear in mind that all of your save data is tied to your Epic account that your PSN or Xbox is linked to, not the PSN or Xbox account itself.

Try signing into the Epic Games account on the game that purchased the Founder's Pack. If that doesn't work, see what Epic has to say.

Is it possible to upgrade the nameless account to a already existing epic account?