there are a lot of other topics on the forums the same as this, they have told us to be patient as the team tries to fix the issue, there is a lot of other players with the exact same problem
oh i just made a post too about this. Well its a bit annoying that its happened to some of us. I guess its good we make multiple posts so they know how important it is and how annoying it is that after a maintenance update many players cannot get in.
Im sorry for the issue you have. Please try the following. Close and relaunch the Steam client. Then go to Steam Support :: Verify Integrity of Game Files in order to Verify Integrity of Game Files. Then wait for 15 minutes and try to go back to the game.
Thank you so much for your patience and helping us during this launch.