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I believe you mean you have the physical cartridge for the game, where you have to put the game into the switch to play. The expansion pass should work with the physical version of the game, but you will need to enter the code in the eShop on the Switch and download it to your console.
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![Pokémon Sword Expansion Pass/Pokémon Shield Expansion Pass - Nintendo Switch [Digital]-Front_Standard](https://pisces.bbystatic.com/prescaled/500/500/image2/BestBuy_US/images/products/6398/6398351_sd.jpg;maxHeight=100;maxWidth=60)