Ubisoft has deployed Title Update 188.8.131.52 to Assassin’s Creed Valhalla across all platforms.
This update fixes the issue that has prevented the Yule Festival from being playable if you completed it last year. It is now playable for all.
Because of the issue, the festival has been extended and will conclude on January 27th. Which will give everyone more than enough time to get the new rewards.