Original Post — Direct link
Reproduce:

1. Sign in to Xbox Live
2. Open AC Valhalla
3. Go to Store
4. Attempt to click on any of the buttons (add-ons, property, character, etc.)

Result:
Online Service Error
A problem occurred while trying to communicate with a Ubisoft service. Please try again later
[0x20000005]
Device: Xbox One X, latest software
Console is connected to the internet and all services are running as normal

This has been happening since yesterday and into today, have been unable to view the items in the store or redeem any of the items I got from the pre-order.
over 3 years ago - Ubi-Borealis - Direct link
Hey there guys!

I apologise for the delayed response. In future, please ensure that you post in the correct forums for your query. You are currently in the Assassin's Creed: Odyssey Player Support forum. I've now moved your thread to our Assassin's Creed: Valhalla Player Support forum.

Please note that these forums are now archived, and that you should visit our official Assassin's Creed: Valhalla Discussions forum for further news and support.

I recommend checking out our megathread post on our Discussions forum.

If you need further support, please feel free to open a support ticket or to reach out to us on our new dedicated forums! Thanks!