Digital Rights Management features that allow an account to access content owned by another account, are console features, not game features. As such, Bungie does not have support for DRM features - you should contact Sony for support with DRM.
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I have already contacted Sony and account sharing is working. Considering I have access to all games and DLCs from my brother's library except for TTK specifically, I was told it's not a DRM issue but an issue with the game itself.
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The ability to share games a cross multiple accounts is a console feature. Bungie does not support nor troubleshoot license sharing because it is a console feature. You will need to contact your console provider for assistance.