To find your certificate, click on the profile picture icon, then “My Profile”. You should then be able to see a list of completed courses and any corresponding certificates.
I have the same problem. Even though I finished the HTML course 2 months ago (and I do have Codecademy Pro) the certificate still doesn’t show up.
Have you finished all the modules in the course? This includes all lessons, projects, and getting all quiz questions right.
Otherwise, you can submit a ticket to Codecademy here.
You can submit a ticket to Customer Support at the link I provided earlier.