In-Game sounds won't play through my chosen audio device.

I have a new bug that started in the past week or so. The in-game does not allow me to play through my currently selected default sound device on W10. It will only work through my speakers -- but not through my USB headset. If I set the default device to my headset, the in-game is fully muted and makes no sound at all.

Typically, the game airlocks the sound into whatever the default device was "before" the in-game application is launched. However, now, it is forcing me to use my speakers "no matter what".

What I've tried:

1. Fresh re-install. Cleaned all directories to be sure.
2. Restarting client multiple times with my default speakers set as my headset.
3. Disabling all other audio devices (spakers and any others that are present).
4. Rebooting computer with my default device set as my headset.

By setting my default device, I mean clicking on my sound icon and setting the audio device.

Any help or advice is appreciate! If there is anything I can upload add to the thread or clarifications, let me know!

Thanks!