How can I enable Epic Games two-factor backup?

I have the following problem. And I want to activate the two-factor backup on my PS4 (Epic Games Account). When I log in to the Epic Games page with my PC account and then click on the "Connect Account" icon, he tells me that my PS4 is already connected to an Epic Games account. But I can't log in via the PC with my PS4 account.

I once have a PC account and once a PS4 account. They both use the same e-mail address. Now I have the assumption that I can't log in at the login screen, just because my e-mail address is the same. Because if I click on the PS4 icon when logging in, I should only country etc. Set. It's all very confusing for me.

What is certain is that I can't log in to Epic Games with my PS4 account to enable two-factor backup, nor can I connect my two accounts.

Delete Fortnite and download Apex

So what is not helpful

Turn to Epic Games Support

Thank you.