I’m seeing the same thing, but I assumed that these triumphs were tied to doing the weekly story mission that unlocks upon completing the main campaign.
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Looks like this might be the case, wording of the Triumph is unclear to me. But I did the weekly mission and suddenly the First Contact triumph was claimable. I suppose I'm just confused because I joined at the end of the last season, and seasonal quests had both Chapter style and individual Mission triumphs.