Automatically log out all iCloud accounts

Apple removed that functionality, you need to give notification or email to ask them to logout.

Unfortunately this is not possible anymore as @shrisivakumaran said. As far as Apple Account’s go, there is very little viable reason for an organization to ever want to use them. As an Apple Engineer told me years ago with AppleID’s “The juice is not worth the squeeze”.

@Andixon As others have noted it's impossible to force logout of iCloud accounts, and you'll have to engage your users to have them manually log out. If you haven't already have an Extension Attribute in place to identify your Macs that have been signed in to iCloud see this post by @howie_isaacks : https://community.jamf.com/t5/jamf-pro/icloud-account-info-from-extension-attribute/m-p/333086/highlight/true#M281225

You could use Swift Dialog to alert users that they need to log out of iCloud and provide a button that when clicked will launch the Apple Account pane in System Settings. At a past job, we used the Jamf helper to provide the alerting. The policy could be scoped only to Macs that are logged in. Create a smart group of Macs not signed in and scope a profile that blocks Apple Account sign in to them. Once the users have logged out their Macs will fall into the smart group and get the profile installed.

@howie_isaacks Thanks for bringing up a sore point with Apple's MDM controls regarding iCloud - applying the setting to disable iCloud while a user is signed in will prevent them from being able to sign out.