Zoom Room Calendar - Office 365 Integration

I've set up my Zoom Room but the calendar for the Microsoft 365 resource account is not syncing.

On the Zoom site when I go to manage the Zoom Room > Basic > Calendar > it defaults to No Calendar Service. Even if I try to manually change it to External Calendar Service, when I go to save it reverts the change and goes back to No Calendar service.

Image of the issue: https://ibb.co/PDMfmsD

I already ran the PowerShell commands listed here: https://support.zoom.com/hc/en/article?id=zm_kb&sysparm_article=KB0063474#h_01FPDHQDHWB45N6AT1V67VD054

What am I missing here exactly?