Wb black sn750 250

hello iv got black sn750 250g nvme few weeks back and iv had problem with it not showing up in my bios on the m.2 slots my motherboard is PRIME X399-A my cpu is 1920x iv got windows installed on it and running fine just not showing in up in my bios i dont know why iv tryed looking it up and tryed fixing it my self but nothing i do seems to work iv restalled windows on to still not showing up under the m.2 in the dive window in bios but it do show up in boot up menu if anyone got any input at could fix this problem please do let me know thank you

here the few pics what it looks like