The FMOD logs should appear in the console, make sure you are using development build and that the logging libs are being used: https://fmod.com/resources/documentation-unity?version=2.0&page=platform-specifics.html#fmod-libs-on-static-platforms. You can also change the logging level in the FMOD settings (LOG should provide the most information): https://fmod.com/resources/documentation-unity?version=2.0&page=settings.html#logging-level.