- Check if your Microsoft calendar has been setup correctly to be visible on your lock screen by going to 'Settings'.
- Under the 'Personalisation' tab, choose the 'Lock screen' option.
- On the 'Lock Screen' page, check if the 'Choose an app to show detailed status' is turned 'On' and that 'Calendar' is selected.
- If it is on, try clicking on 'Calendar' again and selecting the specific category that is not displaying events.
- If that doesn't work, try logging out and logging back into your Microsoft calendar account.