PCIE x16 second slot not working

EZ-Latch：PCIe x16 Slot & Connectors with Quick Release & Screwless Design; Fast Networks： LAN & Wi-Fi 6E ; Extended Connectivity：HDMI

The system also provides extensive functional expansion options, including one PCIe slot slot MAXER

pciex16 slot A x8 card will work in an x1 slot, but will be limited to x1 speeds A x8 card will also work fine in a x4 slot It will be limited to x4 speeds

bolaxx slot Notice that the PCIe x16 slot has a retention lever Figure PCIe adapter removal Figure Motherboard with PCIe and PCI slots Tech Tip