Can't log into the game or play offline

When I launch the game from Steam it goes to the launcher and tries to log in but after a minute it says I cannot. At that point, my only option is to exit the game.

Not exactely the same, but similar problem here for the last four days:

Game starts normally, selecting “play offline” (have done this constantly over the last years) also works, but then i can’t progress further - either char i select (i have three offline-chars) makes the “play offline” button blink for half a sec, then nothing happens - starting a new ONline-char instead works - but is not intended from my side…

Support doens’t respond since three days despite having all the required logs and dx-diags…getting sad right here - maybe many others out there are having fun with the D4 beta, but i’d like to enjoy LE