If you have issues with your reward certificate, I recommend you to ask Citi Visa directly via website. Use their Live Chat. Let us know how it went. Good luck.
I just received a Costco City Visa reward certificate amount of $358.14 in the email. I recently switched my monthly statements to paperless. This is the first time receiving a certificate in email. I have been always receiving these checks (certificates) on paper via US Postal Service.
I am guessing they will send a paper copy of the certificate to those who receive paper statements (?). That’s my educated guess.
Again – You may receive your certificate on your own schedule. I receive them, usually in February.