Why is my Microsoft calendar not displaying events from a specific time period on my mobile device?

1. Check the time and date settings on the mobile device
2. Verify that calendar app is currently running the most up to date version
3. Check that the events were synced from the correct Microsoft Calendar
4. Troubleshoot the issue with the calendar app on the mobile device
5. Make sure all Microsoft calendar events are associated with a valid account
6. Reset or uninstall the calendar app if necessary
7. Restart the device before reinstalling the app