And you got the 850 SSD not the 950 which is NVMe?
Assuming this is correct did you install the drivers for the SSD / M.2 during the install?
Or is all before the OS even gets going that you are getting the error? Reset the BIOS to defaults and make sure you have ACHI on.
Enable UEFI and Legacy boot in the BIOS and set the chipset SATA mode to AHCI. Please review Samsung recommendations.