Question New M.2 drive not showing up

[sargan]

New PC build
It has 4 x M.2 slots on the Gigabyte X670E Auros Master
In slot 1 it has as primary M.2: Crucial T700 PCIe 5.0 2TB CT2000T700SSD3
In slot 2 it has WD_BLACK SN850X 4TB PCIe4

PC loaded W11 and working fine so Primary M.2 is OK. (Disk 0)

However when I went into Disk Management Partitions the second M.2 does not show
I removed and refitted the M.2 ..... and still the same.

Obviously keen to know if its the M.2 dive or motherboard ....
Any test from diagnostics or similar .....
In Device Manager it only shows the one device.

Otherwise I guess logically I need to try this M2 card in another slot

 

[SkyNetRising]

Obviously keen to know if its the M.2 dive or motherboard ....
Any test from diagnostics or similar .....
In Device Manager it only shows the one device.

Otherwise I guess logically I need to try this M2 card in another slot

Are both drives being detected in BIOS?
If not, then obviously try a different m.2 slot.

If it is detected in BIOS, then show screenshots from windows

Device Manager,​

Disk Management,​

Windows Storage Spaces (Control Panel/Storage spaces)​

(upload to imgur.com and post link)

BTW - M.2 slots M2A_CPU and M2B_CPU are cpu connected.
Broken/bent pin in cpu socket can cause any of those two slots to become non-operational.