Please search your email inbox including spam and trash for an email with the subject : "Best Wishes! You got a Gift Voucher" from "firstname.lastname@example.org". Please whitelist this email address by adding it to your contacts.
If you did not get an email with your voucher, you can always use the OTP and the link sent as SMS to your phone number to retrieve the Voucher Code. Please check your SMS inbox to retrieve the SMS from "KMPRFY"