Hi,
Thank you for posting in Microsoft Q&A forum.
Have the devices been encrypted manually by a user before? Also we can only use Intune to configure FileVault on devices that run macOS 10.13 or later.
Devices can be identified as Not ready: The device doesn't have full encryption capabilities, but still supports encryption. For example, the device might be encrypted manually by a user rather than FileVault policy through Intune.
For more information, please refer to:
Use FileVault disk encryption for macOS with Intune
Monitor device encryption with Intune
Thanks for your time. Have a nice day!
Best regards,
Simon
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