Greetings! Looks like my key was already used:

The product code you've entered has already been activated by a different Steam account. This code cannot be used again. Please contact the retailer or online seller where the code was purchased for assistance.

Please lemme know if you have another key to try - If not, I'm fine deleting the GA - Thanks !

Thanks for my 151st SG Win ! My current entry/win ratio is 167:1 (unchanged from previous ratio of 167:1)
(this does include 81 whitelist / trade group GAs which tend to have lower entry-counts)
Of the 226 GAs for this game, I've joined 83 of them, so its nice to finally win :)
Key has been redeemed and marked Received - Thanks !

Thanks for coop FPS, darkdroider!