Bumping to bring more attention to this issue and also to mention that while the fix suggested on the first page by changing the default output via sound settings on Win10 did bring me from 0 sound to some sound, the sound still lacks voice acting and major battle cue effects. It's not playable for the intended experience so hopefully the attention being brought to this will spur on more immediate action from the team to fix this.

I am playing on PC with latest updated Win10 OS, RTX 3070 gpu and AMD 5 5600x CPU for reference. Seen a few post about being on PS5 with these issues, so I'm thinking any fixes on our end are likely temporary and it appears the issues are more likely to happen in congested areas / dungeons / trials. The first time this happened was during EW's first mini-boss in the first dungeon. I had been playing fine until that point.