problem "inaccessible boot device"

[admin]

sorry I saw that many of you have read but have not answered anything. 

But is it normal that he does this? Or could there be a problem? 

I'm reading here and there but I can't quite understand where I'm wrong.

Sorry for the late reply. Please check to see if any of the following items apply to your situation:
1. Ensure that the Windows To Go drive is connected directly to a USB port on the computer. Many computers don’t support booting from a device connected to a USB 3 PCI add-on card or external USB hubs.
2. If the computer is not booting from a USB 3.0 port, try to boot from a USB 2.0 port.
3. There is not enough power on the USB port for the USB drive to work, please connect the USB storage device to an external power supply.
4. Use another high-quality USB flash drive or external hard drive to create portable Windows.

Thanks for your answer. 

I believe none of the 4 cases apply to my situation. 

As I have already said the unit is a Samsung ultra fit plus, I think it is a quality brand or am I wrong ?
It is connected directly to USB 3. 
It does not need power and I tried to boot to USB 2.0 but the error persists. 

What else do you advise me to do?

Do you have an external hard drive? Can you try it with an external hard drive? Thank you very much.