It’s possible that your Microsoft calendar still has set the appointments as busy. To resolve this issue, try the following:

1. Check the settings of your calendar event: Make sure that the event is marked as Free or Available
2. Check your Outlook calendar for any blocked updates or rule settings: Make sure that ‘Busy’ is not set as the default value
3. Check for any conflicting appointments: Make sure that any overlapping appointments are marked as ‘Free’ or ‘Available’
4. Confirm the availability settings of your Outlook calendar: Make sure that ‘Available’ is set as the default availability

If none of the above steps resolve the issue, it’s advisable to contact Microsoft Support for assistance.