There seems to be some confusion with the way the account linking and console accounts work. I'll try my best to explain the details so it might be a bit verbose.
When you first start the game on your console (XB/PS4), your XBL/PSN account will be "new" to our system. You are prompted to create a new Epic Games account, login to an existing Epic Games account or to "just play".
If you select to skip the Epic Games account flows, we create what we call a "headless" account which will have your game profile. Selecting to login with an existing account (or creating a new account) basically allows you to use your gamertag to login to that account. In other words, your XBL/PSN login is simply a means to authenticate you so we can retrieve your Epic Games profile (whether it's headless or not). It's just another authentication method just like your email/password or even Facebook/Google if you play on PC in the Epic Games launcher.
Assuming you have a headless account, if you "unlink" your account (by contacting customer service or using the website's account management before it was temporarily disabled to avoid confusion), your profile is still associated with your Epic Games account. In other words, if you unlink your PSN and then try to boot the game in your PS4, to us, that PSN account is "new" (since we no longer have it associated in our system) and will not have any purchases/etc that you may have made before. Those purchases/items are still in your original profile which are accessible by using your email/password.
TL;DR: Your game profile is associated with your Epic Games account. XBL/PSN are simply methods of authentication we use to reach your Epic Games account.
PS. You cannot circunvent the platform lock we have in place. Due to current platform agreements, if you play on Xbox, you will not be able to use that account to use on PC/PS4. If you play on PS4/PC, you cannot use that account on Xbox. Do not try to use the linking/unlinking feature to circumvent that as it won't work.
PS2. If you already have a headless account (because you started playing on Xbox or PS4), don't create a new Epic Games account. Instead, just login to the website using your XBL/PSN credentials and you will be asked to enter an email/password to "upgrade" that headless account
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