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Back 4 Blood
EU: {sub/638757} - can be redeemed only in European countries (confirmed)
RU/CIS without Russia, Belarus: ?
Asia + Oceania: probably {sub/638759}
North America: {sub/638756} - can be redeemed only in American Samoa, Antarctica, Canada, Guam, Northern Mariana Islands, Puerto Rico, United States of America, U.S. Virgin Islands (confirmed)
ME / Africa: probably {sub/638758}
LATAM: probably {sub/633804}
China: probably {sub/633803}
So you need a ME / Africa: probably {sub/638758} key
Check this thread https://www.steamgifts.com/discussion/DbFqg/humble-bundle-wb-100-play-the-legends-mordor-out-of-stock
Back 4 Blood
2 TF2 Keys