Every month, Genshin Impact developers release a few redemption codes for players to exchange for rewards. These are different from the livestream codes and ...
All items in the Mailbox usually expire in 30 days, so make sure to claim the rewards as soon as possible. In this case, you will receive an email from HoYoverse informing you that the code has already been used. Then, enter the relevant codes one by one and click on Redeem. Type in the relevant code here and select Exchange. The rewards will be sent to gamers' accounts via in-game mail. These are different from the livestream codes and don't expire in a day.