Are you still on the platform you purchased it on? if so [url=https://help.bungie.net/hc/en-us/articles/360049196071-Accessing-and-Restoring-Licenses-to-Destiny-Content]try restoring licenses[/url] - if that doesn't work you'll need to contact your platforms support team. If you aren't on the platform you purchased it on, then expansions aren't cross-platform via cross-save.