The first thing to do is try ALL of the options listed here:
Failing the above you can try and update your Realtek codecs - mine were like 3 years old. As it's a codec and not a driver I overlooked updating it. I updated earlier today and all audio (in this game and another I had issues with) work fine now.
Just tick 'accept' and then 'next' > choose your OS and when it's done, restart.
Extras:
I also saw on Reddit that setting your in-game output to 'Speakers' and not 'Headphones' fixed the issue for some.
Hope this helps - Thanks
