TUF A17 (2023) FA707XV unable to detect second M.2 SSD

[MrDolomite]

I have updated the BIOS to 314, which is the latest available for the FA707XV model from the ASUS support website.

Even when I put the original, working SSD into the second (right) slot on the motherboard it is not detected by the BIOS.

Trying to figure out if it is a bad slot or if there is some setting that I am missing.

[Anbby_ROG]

May I ask if you have tried resetting the BIOS settings to default and testing again? 

If the issue persists, we recommend sending the laptop to the local service center for further hardware diagnostics to confirm the problem. Thank you.