Dell 5820 doesn't see M.2 nvme ssd installed in pcie 4x nvme ssd adapter card

Installed 4x nvme ssd adapter card with single M.2 SSD but T5820 doesn't see it. Just want to use it for storage, not as boot drive. BIOS detects the adapter card, but not the SSD itself. Made sure to put the SSD in slot 0.