Calendar integration with Lifesize Icon 600

We are using Zoom with the CRC license + Enhanced API connector. Our conference rooms have Lifesize Icon 600 devices that have been added to Zoom as managed devices and configured as SIP/H.323 phones in Zoom. That all works fine.

I have all the Office 365 calendar integrations setup on the Zoom side, and the calendars are associated with the provisioned conference room devices. I can also see the appointments showing up in the Zoom Portal GUI, when I click on "Calendar Events".

The issue is that these events are not making it down to the physical Lifesize phone. When I activate the "Calendar" button on the Lifesize HD Phone, I expect to see today's events for that calendar. It is just blank.

Has anyone run into something similar and have a solution?

Thanks!

Rich