Events from Microsoft Bookings not showing in BusyCal

Office 365 accounts syncing via Exchange Web Services (EWS) do not support Microsoft Bookings. Use the Office 365 (Microsoft Graph) account type to sync Bookings events.

You will need to be on the latest version of BusyCal (v2024.2.1 onwards) to be able to see events from Microsoft Bookings. Please see more about Microsoft Graph here.