I also got this game on Xbox Series X and went through 47 GB upgrade only to find that I have no dialog audio. Background music is on but can't hear any dialog or effects such as swords etc.
Please post a fix soon.

I only tried AC Valhalla and it doesn't work. This is absolutely ridiculous. Let's hope Ubi can patch it fast.

I also got this game on Xbox Series X and went through 47 GB upgrade only to find that I have no dialog audio. Background music is on but can't hear any dialog or effects such as swords etc.
Please post a fix soon.