As noted above then from time to time the steam sync clears your games and you need to resync to gain back privileges. It makes me glad to have many of the games registered through CD key.I recently noticed that I receive following text:
"to view and participate in sub Forums, you must Register your base game." from two games "Crusader Kings II" and "Stellaris" even when I do have both marked as owned in my Steam account when logged through Paradox Account. I can even start both games from my Paradox Account as well as browse all sub forums for these games.
This is a cosmetic bug for me and I hope you can sort this out in good time.
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