I bought the DLC "Foesaken" and the other previous ones on playstatsion and I connected the account to the pc afterwards. Now I get all the DLC except "Forsaken" although I am in possession of all the objects deriving from it, however now I cannot access some activities that require the DLC
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This is completely normal. As part of performing cross-save, it warns you that the dlc doesn’t transfer & must be purchased on the platform you wish to access it on.