As of yesterday, 5th April, I am experiencing issues with dialogue audio. It seems to have only started happening since I installed Windows 10 feature update 20h2. it could be coincidence but didn't have the issue the last time I played the game a few days ago.

It seems to be direct dialogue audio that is missing (when you engage someone), if you walk past someone in conversation (i.e. Alvis flyting) the audio is fine. I also found there are some movement sounds missing as well, footsteps and fabric shifting sound.

When talking to someone, the subtitles appear and the mouths of the characters are moving, just no audio.

• I have tried renaming the "sounddata" folder, "ACValhalla.exe" and "ACValhalla_Plus.exe" and got Ubisoft Connect to verify files so it redownloaded them. no changes.
• I tried selecting Spanish language pack top see if it was specific to the English pack. still no audio.
• I uninstalled and reinstalled my audio drivers, no changes.

Next I will try a full reinstall of the game and, I'm looking into the possibility of rolling back from 20h2.

Has anyone experienced the same issue and/or can suggest other things to try?

Update: I have reinstalled the game from scratch and it made no difference. I also uninstalled 20H2 but the issue still exists.

I was wondering if this could be my game save but i tried loading a previous save but still the same.

UPDATE: Fixed
 
Even though I rolled back the Windows updates I believe when they were installed it changed something in the audio settings.
 
I found that when I run an audio test for surround sound, only the left and right channel was working, the rest were not. I tried a number of things within windows to resolve it but nothing worked.
 
I am using a Logitech G933 so, I downloaded and installed the latest Logitech G Hub which resolved the problem. It seems Windows updates knocked it out and updating to the latest version of G Hub fixed issue.
 
With the latest G Hub release date being 2021-03-16, I suspect Logitech are already aware of the issue? However, I couldn’t find any mention of it in the release notes.

Hopefully this is useful for someone else experiencing the same issue.

@dicn Hello there! I'm extremely sorry that I, or anyone else, was not able to assist you sooner with this issue. However, I'm incredibly glad to see that you got everything figured out! Thank you so much for continuing to update your post and include all these details. It means a lot to see players wanting to help others in these situations! I've made note of this instance and your resolution steps. Thank you once again!