My father mistakenly bought the destiny 2 bundle pack on his account and not mine. The pack included foresaken, shadowkeep l, and the season pass. It didn't work at first but we figured out how to get foresaken and shadowkeep to work but season pass didn't. Now a few months later I don't have anything at all.
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Game sharing (including DLC) is not a supported feature. If you want to use the DLC, you will have to pay for it on the account that you want to use it on.