Thanks for reaching out and we apologize for any confusion regarding your REI Mastercard. This is unexpected as everyone should receive a $100 gift card for making a qualifying purchase with their REI Mastercard within the first 60 days. Because we do not have any account information here in the community, your best bet to find out more information is to call our sales and customer service team at 1-800-426-4840 or to contact the REI Co-op World Elite Mastercard team on their site. They should be able to get you more information about your account and gift card.
Hopefully this helps, thanks!