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First go into your PSN account online. Do you see the passses OR the individual DLCs listed there as you owning them? If so you need to hit DOWNLOAD on each one to install it on your PS4.

If that's not the issue, did you buy your base game on a DVD? If so the most likely problem is it has a different Sony region than the PSN store you bought the passes from. If that's the case you'll need to contact PSN support and swap the passes for ones from the PSN store that matches the Sony region of your DVD.

And finally, try this:

Good luck!