Hi @john john Pter,
Managed devices are typically company-owned devices that are usually set up and configured by your company's IT or security team.
Unmanaged devices, also referred to as bring-your-own devices, or BYOD, tend to be personally owned devices that employees set up and use. Unmanaged devices can be onboarded and protected just like managed devices. Or, if you prefer, users can take steps to protect their BYOD devices themselves.
If you are using your own device and log in an Office 365 account,, it should be count as Unmanaged devices.
Blocking or limiting access on unmanaged devices relies on Microsoft Entra Conditional Access policies. So we are unable to apply those settings without license. Learn about Microsoft Entra ID licensing For an overview of conditional access in Microsoft Entra ID, see Conditional access in Microsoft Entra ID.
Here is the document for reference
https://learn.microsoft.com/en-us/sharepoint/control-access-from-unmanaged-devices
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