The referral program is designed to give new users a smooth introduction to Wombat with plenty of actions. That means the codes are only valid for recently created accounts. If the account trying to redeem a code was created over 14 days, the code won’t work. If the referent has already redeemed a code before, it will not work either.
If you’re positive that none of this applies to you, let us know via email or on Telegram.