Diablo II: Resurrected launched September 23–and in its first week since release, certain players are experiencing character lockouts, and others are also seeing their offline characters disappear or lose progress.
The character lockout error seems to be the system not registering that players have gone off the server, thus throwing up the following error message when players try to login again, “Failed to enter the game. This character is already in a game on this server. Please try again.”
Blizzard attempted to fix both errors and other issues with a maintenance update on September 26, but it appears that certain characters still remain locked, judging by replies underneath the maintenance tweet and the continuous addition of new messages in bug report forum thread–an issue that Blizzard says it is looking further into and trying to address.
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Source: Game Spot Mashup