At the time of this writing, there is a widespread error that says “Unable to find a valid license for Diablo IV (Code 315306).” This is happening, obviously, to people who very much have indeed purchased the game
Unable to Find a Valid License for 'Diablo IV' — How to Fix
Unable to find a valid license : r/Diablo
Unable to find a Valid License Error Code 315306
Diablo 4 error code 315306 and 'unable to find valid license' has an easy fix
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Diablo 4: 'Unable to Find Valid License' Error Fix
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Unable to Find Valid License - Diablo 4 Error Code Explained
How to fix Diablo 4 unable to find valid license error