[Solved] Enabling Sandbox feature in LTSC IoT screw the system and it won't boot, any idea why?

Hi,
I am using Windows 10 LTSC IoT.
Updates are complete till today.
Each time I enable the Sandbox feature and it asks to restart, the system breaks and won't restart, and I have to reset the computer.
Any idea why this happened?
I've even tried only to have a regular full clean setup, only add drivers and updates, and then enable the sandbox feature, but I still screwed the system and broke it after restarting and directly going to repair the system.

 

Thanks for your reply my friend.
Where to check if I have this feature on or off?

 

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@pm67310
I've just restarted, and it worked.
Thank you so much, my friend.
Enabling virtualization, UEFI, and secure boot were the keys.
Thanks!