I pre-ordered the game way back in 2017. Bought Destiny 2, and expansion pass for $90. Now I go back to play the dlc, the game has moved to steam and I don't have the dlc available to me.. Very frustrating.
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If you are referring to the year one DLCs, which were Curse of Osiris and Warmind; those expansions are now included in New Light, which is free for all players. With the changes to the progression system, it changed how players access those legacy campaigns. If you visit Amanda in the Tower Hangar, she should have the legacy campaign quests available for you.