Make sure that you properly install the M2 SSD in the M2 port. Then reboot your computer. If that doesn’t work, then shut down your computer using the power button. Disconnect your power cord, open the computer from the bottom, and unplug the SATA cable from the motherboard. After that, open the M2 port, disconnect the SATA cable from the M2 SSD, and plug it back after 10 seconds. Then, connect the power cord and start your computer.