Hello GTFord,
Thanks for the reply and sharing the details. Sorry for the late response.
For this case, we encourage you to submit feedback to our Outlook support team for including the iCalendar for syncing on New Outlook. New Outlook is still on Preview release and your suggestion about the improvements for this platform is highly appreciated.
For the guide on how to send feedback, please check: How do I give feedback on Microsoft 365? - Microsoft Support.
Have a great day!
Regards,
Kathy A.