Hi Derik,
When did you pass the rapid exam? It usually take a while for the data to process. If I remember correctly, this could take a few days. So in case you just passed the exam, I would wait a day or two. If its already been a couple of days since you received your certificate, get in contact with Mendix directly by opening a ticket via Mendix support. They will fix it for you.
Good luck with the Intermediate exam!