driver/hardware or compatibility issue are possible reasons. try to narrow down your problem in this manner
1. reset connection via cmd and run these commands: a.ipconfig/renew and b. ipconfig/flush dns
2. reset wifi connection then restart device then try to connect again
3. try to update driver(via lang or download updated driver) then test again.
incase still not working then probably hardware issue, you can try to open laptop and locate the wifi chipset, clean and reconnect and try again. incase it still doesn't work then worse the hardware is damage/not working
hope it helps