2 x Motherboard

How to Install a NVMe SSD Into Any PC Without an Slot m 2 nvme slot PCIe SSDs 2 or 4 lanes) 1 x 67 pin key M slot 1 x 67 pin key B slot Interface: SATA PCIe Supports modules m2 slot screw NVMe SSD to PCIe x4 Mobile RackBackplane wRemovable Tray for PCI Express Expansion Slot, Tool-less Installation, PCIe Hot-Swap Drive Bay

m2 slot mainboard My M2_1 slot does not seem to be detecting my NVME SSDs, they work fine in the M2_2 slot Does anyone know why? I want to use both M2