Was this content purchased using the PSN ID that you are attempting to play with? If it was, try restoring your licenses.
https://www.bungie.net/en/Help/Article/12181
If you continue to encounter this, you’ll need to reach out to PlayStation customer support.
https://support.us.playstation.com
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I purchased this dlc on the same psn account im attempting to play with and I have tried restoring licenses many times in settings. Thank you so much for even answering I will now try to reach out to PlayStation customer support. But if u do come across any new ways I could fix this frustrating problem then please let me know