Downloadable content that has been purchased or redeemed for Splatoon 2 isn’t appearing in the game.
DLC can be only be used with versions of Splatoon 2 that are intended for the same region where the DLC was purchased. (For example, DLC purchased with an Australian Nintendo Account will not work with a Japanese version of the game.)
Complete these Steps:
Verify whether the missing DLC is from the Octo Expansion (purchased from Nintendo eShop) or the download code that was distributed to Nintendo Switch Online members.
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