Here are a few Diablo 4 invalid licenses fixes and workarounds for those seeing error code message 315306 show up on PS4, PS5.
Diablo IV error code 315306 or “Unable to find a valid license for Diablo IV
Can't Fix Logging in Diablo? HERE How to FIX unable to find a valid copy license Error Code!
Diablo 4 error code 315306 causes 'valid license' issues on PlayStation and Xbox: Here's the fix
How To Fix Diablo 4 Error Code 315 306 Unable to find a Valid License - PS4 / PS5
Unable to find valid licence error - ps5 : r/diablo4
Diablo 4 unable to find valid license - how to fix error code 315306 on PS4 and PS5
How To Fix Diablo 4 Error Code 315 306 Unable to find a Valid License - PS4 / PS5
Diablo 4 error code 315306 can be overcome if you pay up first
PS5: unable to find a valid license after a while in the queue : r/Diablo
Diablo 4: Unable To Find A Valid License [Quick Fix]