Question 256 GB M.2 NVMe SSD is not detected in Asus prime Z390 M-Plus motherboard, why?

[colat]

256 GB M.2 NVMe SSD is not detected in Asus prime Z390 M-Plus motherboard, why? I have disconnected the SATA SSD, but still the M.2 NVMe SSD is not detected. What should I do?

 

[Lutfij]

256 GB M.2 NVMe SSD
Make and model of your SSD?

Asus prime Z390 M-Plus
What BIOS version are you on for said motherboard? Which slot is the SSD populating on said motherboard?

 

[colat]

256 GB M.2 NVMe SSD
Make and model of your SSD?

Asus prime Z390 M-Plus
What BIOS version are you on for said motherboard? Which slot is the SSD populating on said motherboard?

I think, this is the M.2 NVMe SSD: https://www.transcend-info.com/product/internal-ssd/mte220s

Bios version:
SMBIOSBIOSVersion
3006

1TB SATA SSD is on port SATA1 or sata port 1.

I have tried connecting the 256 GB M.2 NVMe SSD to both M.2_1 and M.2_2 slot. Same problem.