I started season 24 two days ago, but after the first day, I found that I am playing all alone. I haven’t see any other player online in the last 24 hours. I can only start game (i.e. play alone), but cannot join game (i.e. join other player’s game). I cannot leave clan (error: Diablo III game servers are not available. Please try again later. Code 34200). Any technical help here?
Try the following:
Press windows key + R > Type %programdata% > Click OK > Delete the Battle.net and Blizzard Entertainment folders
Press windows key + R > Type %appdata% > Click OK > Delete the Battle.net folder
Press windows key + R > Type %localappdata% > Click OK > Delete the battle.net and Blizzard Entertainment folders
Then relaunch the Battle.net App as Administrator and run a Scan and Repair. Once that is done you should be able to launch the game and play without any errors.