Hello@kokooo471982 ,

Welcome to our community.

If you are experiencing issues with your devices not detecting the Wi-Fi network of your TP-Link Archer Router, or only can detect 2.4G, or 5G, please follow the troubleshooting steps below:

1. Check the WI-FI lights, if they are off, press the WI-FI/WPS button on the back of router for about 5-10s until the lights flashing, then 
    confirm whether the WI-FI can be detected when lights are stable.
2. If WI-FI lights are on, open the Tether APP, go to More > Wi-Fi Settings, and make sure the 2.4G/5G network is enabled and not 
    hidden.
3. If you are only seeing the 2.4GHz network (TP-Link_XXXX), not the 5GHz network (TP-Link_XXXX_5G), please disable the "Smart 
   Connect" feature.
4. Check whether all your devices can't see the TP-LINK WI-FI, if only certain devices, update the driver or system on your wireless client 
    device.
 5. Try another Router with your wireless devices for a comparison.