Either your brother has removed that console as being his primary or you have made the console your primary.
You should recheck that the PS4 is your brother's Primary console and not yours.
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We've already checked everything including his PSN account (where you can see all connected devices etc) to be sure, and I have access to literally everything else from his library (games, DLCs and PS+). I also tried resetting the licenses.
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Hmm, my wife hasn't had issues accessing TTK on our PS4. If there was some DRM patch or something I would have noticed. The other two expansions have been purchased too, I'm assuming?
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I used to be able to access TTK and since there have been a lot of updates since then, I thought it might have messed things up... The other two expansions have been purchased too indeed, from my brother's account. Actually, I cannot access the playstation store while playing on my account (even though I can access it from home screen). When I click on a TTK mission, it opens a window and I can redeem a code for TTK or buy it. If I try buying it (I thought it might "trigger" the sharing) it says that the PS store cannot be accessed. Maybe that's the problem there?