Hi,
It is possible for a drive to appear in Bios, but still be non-functional..
The Bios basically reads the Bios of the SSD.. Just because the SSD's Bios works does not mean the SSD works..
Since the SSD has never been formatted it should appear regardless as to whether you select Legacy or UEFI Bios..
Is this a typical SATA SSD, or is it one of the NVMe drives ?