Question M2A M.2 port doesn't work on Gigabyte Z490 Aorus Ultra ?

[nero519]

I recently installed three M.2 SSDs on my mb, but only two of them are available in disk manager/bios.


They are installed like this:
M2P: Samsung 980 pro
M2A: WD SN770
M2M: WD SN770
This is what I have in diskpart


This are the restrictions in terms of lines, it doesn't seem to show anything related to my problem:


Maybe I'm missing a setting in my bios, kind of lost with this:
manual: mb_manual_z490-aorus-ultra_1001_e.pdf (gigabyte.com)
mb diagram


How it looks in bios, I swapped the M2A and M2M disks and both worked fine, just not on the M2A port:



https://www.reddit.com/r/pcmasterrace/comments/15d87v9/aorus_z490_ultra_m2_port_doesnt_work/