Not sure if you really purchased it on 3/14, but the API shows you have an unlock of Season of Dawn which was the season prior to the current season. If you did not buy Season of Dawn separately then your Shadowkeep purchase was done prior to 1700 UTC on March 10, 2020 and thus the free unlock was applied to Season of Dawn.
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Thank for you reply ~ which means i will get the season tickets in the next season ? descriptions in belows are DLC on Steam Forsaken Features: Hunt Down Uldren Sov and avenge Cayde-6 Nine Additional Supers Exotic Quests to Unlock Powerful Gear Year-2 Dungeon and Raids Story Missions, Adventures, Destination Activities, and Three Seasons: Season of the Forge Season of the Drifter Season of Opulence
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That was for the forsaken annual pass seasons which have already passed. You can still play those seasons right now as they worked differently from how the seasons work now.