Zoho Calendar with Microsoft 365's Outlook calendar

Could you please explain how to integrate the Zoho Calendar application with Microsoft 365's Outlook calendar so that schedules from both calendars are displayed in the Outlook calendar?

I tried setting it up with reference to the following site:
https://www.zoho.com/calendar/help/sync-outlook-calendar.html
However, since Outlook Calendar is not available as an option for syncing with third-party tools, I could not establish the integration.

Additionally, if there is a method to input Zoho Calendar entries from the Zoho CRM tab or to input from the Outlook calendar to the Zoho Calendar, please let me know.

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