Hello @OlderThanDirt ,

Thanks for contacting our community.

Please try these steps in order and check if the 2.4G/5G LEDs light up after each attempt.

1. Validate your router's Wi-Fi password
On your phone, forget the router's Wi-Fi network, then reconnect to it and manually re-enter the password. This confirms the password is correct. (Guide: How to remove existing wireless network profile on Android&iPhone)

2. Upgrade the extender's firmware
Outdated firmware can cause connectivity issues. Update the RE715X to the latest firmware version. (Guide: How to Update Your TP-Link Extender Firmware: Three Methods)

3. Reset and reconfigure the extender
Use a pin to press the reset button for 1 second until all LEDs flash, then open the Tether app, tap the "+" button to add the device, and follow the on-screen setup instructions.

4. Optimize your router's wireless channels
Set your router's 2.4GHz channel to 1, 6, or 11, and the 5GHz channel to 36, 40, 44, or 48 to reduce interference. (Guide: How to change wireless settings on TP-Link Wireless Router)
 

If the extende still doesn't workk after going through all the steps above, please contact Local Support for further assistance.