There was an issue when you wrote this, see https://status.mendix.com/.
“Monitoring - The issue has been solved but we will keep this incident open in order to monitor the situation better.
May 30, 2023 - 15:19 CEST
Investigating - We have noticed an issue with Academy Portal. More specifically users cannot do new registrations for Intermediate and Advanced exams and exam results cannot be processed.
We are try to investigate the issue, we will update the status of this incident as soon as we have a clear overview.
May 30, 2023 - 11:58 CEST”