Disconnect at Character List on All Realms

"Hello everyone,
Until yesterday, I could connect to my account without any issues.
But today, after passing the two-factor authentication and reaching the loading screen for the character list, I get disconnected and am returned to the game's initial login screen.
What could be the problem?
I've tried everything:

· Antivirus checks
· Changing the game folder
· Restarting my computer
· And more...

And this is for all realms.

What should I do? Please help."