I used these three methods to get me back into playing fortnite. All of them worked due to me constantly getting login errors so I decided to make a video to help people get back to gaming. Subscribe if I helped you!
1) Sign out of every account the console’s & your epic account if you have one
2) Hold the power button while the console is active wait till it completely shuts off then unplug & try again.
3) Play another game preferably a disc game then try to see if it works