Diablo 4 Launch Plagued by Login and License Issues.

Diablo 4 players on PS5 and some on Xbox are experiencing an "Unable to find a valid license" error, preventing them from playing the game. Blizzard has acknowledged the issue and is investigating. The error seems to be more widespread on PS5, but some Xbox players are also affected. There is currently no fix, and players are advised not to take drastic steps like reinstalling the game. The issue is console-specific, so it does not appear to be a server meltdown like the Error 37 issue that plagued Diablo 3 at launch.