I have the same problem, but my company google account only runs on googles calendar and email app, for security reasons I guess, it is not able to run on iPhones calendar app.
Even if my company emails and calendars ran on the iPhone apps, it would require me to setup my personal Tesla account with my company email, in order to sync. Tesla needs to be more flexible here, it’s really too bad I can’t use the calendar/navigation features on my Tesla, because Tesla does not understand that a lot of their customers are using both a company and personal calendar and email address.