From GameWatcher: “Ubisoft today announced that it has pushed to live servers a hotfix that addresses the critical bug encountered when starting Assassin’s Creed Valhalla’s A Seer’s Solace quest.
Assassin’s Creed Valhalla’s patch 1.0.2 essentially made it impossible to start A Seer’s Solace, as the cutscene tied to doing so wouldn’t trigger after it went live.”
Source: N4G PC Assassin's Creed Valhalla Hotfix Addresses A Seer's Solace Critical Bug