If you did not acquire Threaded Needle and Brass Attacks during Season of the Chosen, it appears they are removed from the loot pool and cannot be acquired, even when using focused engrams. I am personally experiencing this and have seen multiple threads on reddit with the same issue. https://www.reddit.com/r/DestinyTheGame/comments/nmc6wq/threaded_needle_season_of_splicer_drop/ https://www.reddit.com/r/DestinyTheGame/comments/nwq7nb/brass_attacksthreaded_needle_not_in_loot_pool_if/ https://www.reddit.com/r/DestinyTheGame/comments/niwioi/does_threaded_needle_not_drop_this_season_or_am_i/