Safeguard 7 on Surface Pro 4

Hi all,

I have some problems to configure Safeguard on Surface Pro 4.

With the same configuration that I use on others Windows 10 64 Bit PCs, when install Safeguard 7.0.35 on Surface Pro 4 64 bit with three Partition, one is hidden, bitlocker encryption start only on first  partition leaving others partitions not encrypted. (don't start automatically encryption an all Volume)

The same thing happens when apply the same situation on Dell 7470.

The only thing that I see is that devices have M.2 SSD disk.

There is some indication about this or there is a particular configuration on BIOS?

Thanks for all.

Franc