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If you change your primary communication email address on your Amazon developer account before the end of the month, the promotional code will be sent to the new email address listed on your company profile. If you change your contact information after the end of the month, the communications may still go to your previous contact email, so you should also check that email address as well as your junk mail folders. If you believe you should have received an email per these criteria but if you did not receive it, please contact us at https://developer.amazon.com/public/support/contact/contact-us.