Did you try Remote connecting wwise to the package build version of your game ? If yes what do you see?
The first thing I would check is that your, Unreal Project settings are indeed pointing to the Wwise audio folder that has your soundbanks.
Then I would rebuild all soundbanks from the Unreal BUild Menu, and re-import the rebuilt banks. Test it plays in editor without Wwise connected, and then rebuild the Unreal package.