Hello. Bungie does not handle refunds, as they are not the retailer.
Shadowkeep itself should be able to be game-shared, but Season Pass premium track rewards are account based and cannot be transferred to other players. Gameshare is not officially supported by Bungie or Destiny 2 and is instead a platform feature. Please reach out to your platform support if you are having issues regarding Gameshare.
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Thank you for your info :)