Hello @jackpine1 ,

Welcome to our community.

May I know what the model number of your device is? Please refer to

How to find the model number of your TP-Link device 

How to find the hardware version on a TP-Link device

Here are some suggestions that may help you:
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.