A detailed post-mortem is now available at: https://help.schoolyear.com/hc/en-gb/articles/39707885998493-Incident-Postmortem-on-30-09-2026.

Since the fix was deployed, we have received no further reports, and exams are starting successfully with AVD again. This confirms the fix is working as intended.


The issue seem to be completely resolved now. We will follow up with a post-mortem as soon as possible.

We have identified the new domains and deployed a fix to production that updates the whitelist for both running and scheduled exams.


Students who restart the Schoolyear Client will receive the updated whitelist, and the issue should no longer occur.

We have identified that Microsoft has changed some of its domains. As a result, the enforced whitelist now blocks these domains, which prevents exams from starting. We are currently investigating how to update the whitelist and apply the change to existing exams.

We have received a couple of reports that students are stuck an a white screen while launching the AVD exam. We are currently investigating this issue.