I took a break from destiny, and just recently got back into a few days ago. Only to find that I no longer own Beyond Light Forsaken or ShadowKeep, I have completed all the dungeons from these dlcs. Now I have quests to go back and do some activities from those dlcs however I can’t do it because I don’t own them anymore. I attached screenshots to prove I have weapons from those dlc
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Is it possible you were game sharing or using them via game pass? If not then first thing to try would be [url=https://help.bungie.net/hc/en-us/articles/360049196071-Accessing-and-Restoring-Licenses-to-Destiny-Content]restoring licenses[/url], if that doesn't fix it then you'll want to contact Xbox support to have them look into it for you.