1. Check the settings
     • Open the app, tap on the settings and select the account.
     • Enable the activity and Agenda settings from the list.
2. Restart the device
     • Turn off the device and turn it on again.
3. Remove and reinstall the Microsoft Calendar app
     • Drag the MS Calendar widget to the Home screen.
     • Deactivate the widget and delete the app.
     • Reinstall the app and customize the widget.