Setting up and managing device configurations using Intune
@陳子毅 Thanks for posting in our Q&A.
For this issue, if you want to enroll devices to intune, at least you will have an intune license. There are user licenses and device licenses.
https://learn.microsoft.com/en-us/mem/intune/fundamentals/licenses
However, if you use device license, there are some limitations. Intune app protection policies, conditional access and ser-based management features are not supported on such devices.
Hope it will clarify something.
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