I believe the best course of action is to open a support ticket with the Databricks Certification Support team, as they are the ones who can investigate issues related to exam scheduling and Kryterion.

They typically respond within **24–48 hours**. You can submit a support request using the instructions provided here:
https://help.databricks.com/s/contact-us?ReqType=training

However, I’m mentioning @Cert-Team here in case they have any additional guidance.