Here are a few Diablo 4 invalid licenses fixes and workarounds for those seeing error code message 315306 show up on PS4, PS5.
How to Fix Error Code 315306 in Diablo 4 - Green Hat Expert
ps5 Early Access issues? : r/diablo4
Diablo 4 Invalid License issue: Code 315306 error explained - Dexerto
Diablo 4: This Trick Might Fix That 'Unable To Find Valid License' Error - Gameranx
Diablo IV error code 315306 or “Unable to find a valid license for Diablo IV
Diablo IV Error Code 315306: Invalid License and How to Fix
Diablo 4 Invalid License Error 315306 Fix - GINX TV
Diablo 4 Invalid License Error 315306 Fix - GINX TV
ERRORS - BUGS - LONG QUEUE TIMES] MEGATHREAD : r/diablo4
How to Fix Unable to Find a Valid License for Diablo 4 Code 315306? - News
Diablo 4 Unable To Find Valid License PC, Diablo 4 Login Issues
Diablo 4: Known bugs, launch issues, and how to fix them