Hello there[url=https://media.giphy.com/media/KOVlHmbBA09XO/giphy.gif],[/url]
Expansions (Forsaken pack /Shadow-keep/Beyond Light/30th Anniversary pack/Witch Queen) do not transfer and must be purchased on each platform you wish to play them on.
[quote][b]Do my previous game purchases transfer across platforms?[/b]
[url=https://www.bungie.net/7/en/CrossSave]No. The things you have purchased from your PC or Console stores will remain on the platforms where you bought them. These includes games or balances of Silver. Cross Save enables you to access the Guardians and Collections on one Active Account from wherever you play. The things that you acquire for your characters in the game are what move with you from one platform to another.[/url][/quote]
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That's my point, it already has been purchased on both platforms. I purchased the DLC on both PS5 and PC, but it's tied to platform and Bungie account.
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licenses are tied to the platform account, specifically. So your Steam account owns the license as sold by Valve/Steam. Your son's ps5 account owns the license to play there. Game share on console should allow you to borrow their license to play there, however, the expansions are not sharable via Steam.