Hi, I've been locked out of the seasonal quest for the season of the witch as i did not have the milestone when i completed the intro mission for the season. I later found this out when the portal did not open after completing the mission and finding the milestone within the quest archive. I understand this may be a issue that needs the game to be updated to resolve, and await a replay.
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Hello. Records show that you own Season of the Witch. To begin Season of the Witch: Complete the "Way of the Witch" mission located in the H.E.L.M. Once you do that, complete a run of Savathun's Spire and then you should be able to access the portal in the H.E.L.M.