Realm screen takes minutes to load before displaying toons on any server.
Once server is selected, it takes another minute or so to display the list of toons on that server.
Select a toon and try to enter the game with it, only to have it show:
“Character not found”
Epic launch fail.
Best to keep it to the ongoing thread here:
https://us.forums.blizzard.com/en/wow/t/log-in-issues-characters-not-loading/733095
I would, but it’s not as satisfying 
Hasn’t been an update for some time, looks like this issue has been rolling for hours and there is no quick fix incoming.