Have you redeemed the code on one of your characters already? If so, that's why. Codes can only be used on one character (atleast this one). Or they took the code down.
I doubt it; I neither remember it, nor have it in my notes. Whenever I get a new code I put it I my master file for dcuo info. I think it had an expiration date.
That is incorrect... As of January 8th, both the SIEZETHETHRONE and FACEYOURFEAR claim codes still work, at least on PC - I'm unsure about the consoles.
I can confirm that it still works right now (well, not right now since daily maintenance is going on).
It's probable that you've used the code previously. I tried it on an alt the other day and it popped for me on US PS4. I'll try it with another alt later see what happens.
Both FACEYOURFEAR and SEIZETHETHRONE are one redeem only - use them wisely on the character you want the things on (though IIRC the material from the former, and the aura included in the latter are both transferable to another character until consumed). FACEYOURFEAR is a material as has been noted, and SEIZETHETHRONE is an Atlantis Starter Pack that includes some starter equipment and a Seafoam aura. The equipment won't be any use to an established character in itself, but is salvagable for levelling augments. Think the starter pack had an Aquaman emblem (or something similar) as well? Both worked fine on EU PS4 when I used them many months ago. (Also, IIRC, neither one dropped anything directly into the inventory, but allowed redeem of it - once - from the redeem window once the code was accepted. If you enter the code and it accepts it but you see nothing in the inventory, look in the redeem list.)
faceyourfear , beyondthepage and WWDAY2017 doesn't work for me but seizethethrone do work for me (i'm on pc)