Deleted

where did you get the key from?
report it to them

If this is a key for a game you've won on SG then comment on the GA so the creator can see it's a duplicate key (i.e. already redeemed). They may be able to replace it with a working key (I sometimes screw up and paste in the wrong key!). Otherwise you may agree to a deletion, or mark the GA as 'Not Received' (after 7 days).

If it's a key you bought then contact the seller.