Make Bookings calendar events private by default?

How about this:

1.    Manually Marking Appointments as Private – If changing calendar permissions isn't an option, staff members can manually mark each appointment as private in Outlook after it's created. This isn't ideal for automation, but it does prevent visibility across the organization.
2.    Using Outlook's Default Sensitivity Settings – In Outlook, you can set the default sensitivity level for new calendar entries to "Private." This ensures that all new appointments, including those created via Bookings, are private by default.
3.    Custom Forms in Outlook – You can create a custom appointment form in Outlook that automatically marks events as private. This involves publishing a custom form and setting it as the default for new calendar entries.
4.    Power Automate – While you've encountered difficulties linking Bookings to meetings via Power Automate, you might explore using a flow that modifies the calendar entry after it's created. A flow could detect new Bookings appointments and update their privacy settings.