I've heard multiple times directly from Apple employees that there is no way to login to iCloud on your work machine using a company-controlled account. Many people create new Apple ID's which they only use while working there, but others just use their personal iCloud accounts. You are, of course, not supposed to store company data in iCloud. But thanks to Apple's own efforts, it's difficult to use a Mac without being logged into iCloud (for example if you want to use the App store), and some data can easily spill into the iCloud account.
If accurate, it is of course patently absurd that Apple has left this an unsolved problem.
If accurate, it is of course patently absurd that Apple has left this an unsolved problem.