Here are a few Diablo 4 invalid licenses fixes and workarounds for those seeing error code message 315306 show up on PS4, PS5.
Diablo 4 395002, 315306, 300008 and 300202 errors explained
Diablo IV Error Code 315306: Invalid License and How to Fix
How to Fix Unable to Find a Valid License for Diablo 4 Code 315306? - News
How to fix Unable to find a valid license error Diablo 4
Diablo 4: 'Unable to Find Valid License' Error Fix
How To Fix Diablo 4 Unable To Find Valid License Error Code 315306 - N4G
Diablo 4 - This might Fix Error Code 315306 (All information without guarantee!)
Unable to Find License?! : r/diablo4
Diablo 4 Invalid License Error 315306 Fix - GINX TV