Diablo II Resurrected has been updated to version 1.06 today by Activision Blizzard. You can find out the complete patch notes for this update from here.
Since the servers of the game are still experiencing issues, Activision Blizzard is working on trying to resolve them as soon as possible. The latest update appears to tackle this problem by implementing a login queue when there are a large number of users trying to connect to the servers.
You can find out the details on this update with the patch notes below, or you can have a look at them on the official website.