I get a warning that I need Forsaken, but I have bought it and it tells me to go to help.bungie.net/de, but I can't find help
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Sounds like you bought the season pass but not Forsaken. They are different
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If the message is about content not found then likely you just ought Forsaken Annual Pass which is a DLC for Forsaken. It does NOT include Forsaken, but Forsaken is required for the Annual Pass to work.