You'll likely want to work with PS support for this - one thing to try though is [url=https://help.bungie.net/hc/en-us/articles/360049196071-Accessing-and-Restoring-Licenses-to-Destiny-Content]restoring licenses[/url] on the purchasing account and verifying the primary console is set as your PS4
Bungie doesn't support gamesharing and don't guarantee that it'll work though.
Alright I'll try restoring the licenses, I spoke to a couple of people they said for them it was working through gameshare so maybe it silk might work for me too.
Do you know if it's possible that if I download the game again from the account on which I purchased the DLC that it might help? Cuz when I downloaded the game it showed me that I have to download content 4,5,6 to be able to play.