Hello @Alejo77 ,

Welcome to our community.

When you're getting an "Incorrect password" error during extender setup, here are some steps that can help:
1. Verify the wireless password:
Make sure you're entering your router's WiFi password (not the TP-Link ID password). Double-check for any spaces, capitalization, or special characters.
2. Ensure your router's WiFi is working:
Confirm that other devices can connect to your router's WiFi without issues using the same password.
3. Reboot both devices:
Restart both your router and the extender, then try the pairing process again.
4. Hard reset and reconfigure:
If the above steps don't work, I recommend performing a hard reset on your extender and setting it up fresh using the Tether app:
• Press and hold the Reset button on your extender for about 1-8 seconds until all lights turn on momentarily
• Once reset, open the Tether app and click the "+" button at the top right to add your extender
• Follow the setup wizard in the app

For detailed instructions on setting up via the Tether app, check out: How to configure Range Extender via Tether APP