Sending, receiving, and organizing email in Outlook on the web for business
According to Microsoft's latest update for Incident MO1550821, Microsoft is still working to restore the affected infrastructure. However, no specific estimated time for full service restoration has been provided yet.
Outlook relies on Exchange Online for its email services, and Exchange Online is among the services affected by this incident. This may explain why you are currently unable to access Outlook or communicate with your teachers.
The incident is currently classified as Service Degradation, and Microsoft is actively investigating and working to mitigate the issue.
You can check the Microsoft 365 Service Status for the latest service availability updates.
Hopefully, Microsoft will provide a more specific timeline in its next update. I recommend checking the service status page periodically for further information.