Is it really impossible to force an Intune sync from the command line?

I think I'm going to tackle this a different way. Since the only reliable method to force an Intune sync is with a reboot, I'll just make that part of my process now. It's easy to force a reboot in the CLI (shutdown /r, or Restart-Computer). The problem comes with logging back in. That still requires the GUI. However, you can leverage the Windows Logon Options section of local Group Policy to automatically log in and lock a computer following a reboot or power-on event. There isn't a way to modify local Group Policy settings via Intune or even PowerShell (that I've yet found) for cloud-only shops, so this is a one-by-one modification using the GUI. Of course, every log in after a reboot is a one-by-one affair using the GUI as well, so this change is well worth the frustration. I'll test out my hypothesis on some devices and see how it goes.

Thanks everyone.