I won't lie, I skimmed your flick (your voice is pretty muffled) and in what I watched, heard you say "this is more on Epic" like 3 times..
It's not. It's Sony. Everyone (almost bar a few) in this thread have said it's Sony.
You have an error message in the game that, short of putting Sony's customer support number on it lays blame on Sony
You have both major spokesmen (Reggie and Phil) from the other majors saying "what the 'other' platform does imposes is up to them"
It's now basically a connect the dots between two dots.
As much as you might want to close your eyes and put your hands over your ears and wish its was on Epic. It's not.
That's merely because people don't quite understand how Epic Accounts work, they aren't the kind of thing you have in other games really.
I explained how they work in the vid, that both PSN/Xbox Live are authentication services, once you login successfully and get passed over to Epic then it's nothing to do with them, they merely match up your PSN/Gamertag to your Epic Account and you're fully in the Epic Account eco system playing Fortnite.
Even cross-play is available (across all devices) at the touch of a button for Epic (they accidentally did it once), Epic has full control over everything that happens in Fortnite. The whole linking/unlinking has been available from the start and was working fine, suddenly it's not, that's an Epic feature to fix not the platform holders - it's nothing to do with them.
With all the major figures at E3 for the next day or two, people worked themselves into a furor because there was no response or generic PR one. There's only a skeleton crew on hand, in a few days I bet it'll all be cleared up of what is actually going on.