United States only. Kung Fu Tea, "Thank you for your patience and understanding! We’re resuming the Kung Fu Tea x Guild Wars 2 Promotion on Thursday, September 20th @ 9 AM PDT/12 PM EDT.
Please note you can redeem only one Heroic Edition Code and one Dragon Emblem Outfit Code. If you previously redeemed any of the codes, you won’t be eligible for the promotion again."
https://www.kungfutea.com/blog/2018/9/19/update-2-guild-wars-2-dlc-promotion