Diablo 2: Resurrected "You have Not Been Online in the Last 30 days" error when opening first time.
You may have encountered this "You have Not Been Online in the Last 30 days" message once you open Diablo 2 : Resurrected for the first time. This is how I was able to resolve it. Hope it helps and works for you as well. (PS: Its really horrible on Blizzard's behalf not to already have a solution for this)