[SOLVED] How to get computer to detect SSD

[DJBALLER]

I just built a computer for my brother, and for some reason, when I installed both my HDD and SSD, only the HDD showed up in UEFI and Disk manager, while my SSD has not been detected by any of these. Is there a reason why and is there a way I can fix this?

 

[DJBALLER]

Here are my specs:
AsRock B550 Phantom Gaming 4/ac
SSD: WD Blue 3D NAND 500GB Internal PC SSD - SATA III 6 Gb/s, M.2 2280, Up to 560 MB/s - WDS500G2B0B
HDD: Seagate Barracuda 2TB 7200 RPM

 

[fzabkar]

In many motherboard designs, certain m.2 and SATA ports cannot be occupied at the same time. That's because they share lanes.

Consult your motherboard manual. I had a quick look, but I couldn't find one.