To block access to safe mode, the MDM agent must first be activated, and the technology used for this is "Samsung Knox."

Some entry-level Samsung models do not provide this Knox feature, so blocking safe mode is not supported on these devices.

You can check the list of MDM-supported devices via the following link; devices marked as "N/A" do not support Knox.

https://www.samsungknox.com/ko/knox-platform/supported-devices