Hey there,
As far as we can tell this error code should only appear if you’re using the wrong version of the game. Can you please make sure you’re using the live version of the game, not the beta? I’d actually uninstall all Diablo IV beta data from your console and make sure the live game is fully updated.
Let me know if you still have problems after.
(Note: while there are other login errors at the moment, this is an Xbox specific error code. For playstation users having license errors, check the sticky at the top of the forums.)