Players Receiving “Unable to Find Diablo License (Code 315306)” Errors: June 24th

Update: Blizzard have confirmed they are aware of the issues:

Here’s a quick heads up. If you’re having trouble entering Diablo 4 at the moment, it’s not just you! Many players are reporting issues with logging into the game, specifically getting “ERROR: Unable to find Diablo license (Code 315306)”.

While we’re not quite sure what’s happening, we do know that it’s happening to many players, which will hopefully make you rest a little easier knowing it’s not just you! We’ve seen reports from PC, XBOX and PlayStation players. You might also get other error codes, but the problem is most likely the same. While some players have reported getting back in already, I have received this error myself when trying to log in just now.

Some players report that restarting their PC helped (with some having to relocate their game files), but it may have just been a temporary issue that has resolved itself on their end.

There are many, many more threads like the one above over on r/Diablo4.

Hopefully this will be resolved soon.