I also claimed some stuff recently and it claimed to be in kiosks I never heard of. Like with you, I already tried postmaster and Collections. Doing some more research and will post if again I figure it out.
Sample instructions:
[quote]Emblem: Sign of the Finite Pick up your emblem at the Emblem Kiosk in the Tower. Nov 09, 2019
Shader: Oracle 99 Pick up your shader at the Shader Kiosk in the Tower. Nov 09, 2019[/quote]
English
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Go to your collections and go to general in flair they should be there I just checked and have them though it's weird it doesn't show them as new but system is dumb I guess lol hope this helps.
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If it specifies pickup at a kiosk, it's for Destiny 1, not Destiny 2. AFAIK Bungie hasn't released any D2 keycode unlockables at this time, at least as far as my searching has gone.