@Drz13 

Can you provide the model name of the deco unit your trying to add to your network TY 

  @Drz13 

See if these instructions help 

1. Open the Deco app: Launch the Deco app on your smartphone. 
2. Navigate to Add a Deco: Go to the Network tab and tap the "+" icon (usually in the upper right corner). 
3. Select "Add a Deco Unit": Choose the option to add a new Deco unit. 
4. Select Deco Model: Find and select the correct Deco X10 model from the list. 
5. Follow App Instructions: The app will guide you through the remaining steps, including:
   • Plugging in the new Deco unit and waiting for the LED to turn pulsing blue. 
   • Confirming the LED status in the app. 
   • Choosing a layout that matches your home. 
   • The app will automatically add the new unit to your network. 
6. Additional Tips:
   • For optimal performance, ensure your Deco units are positioned strategically to avoid interference from walls or objects. 
   • Consider using Ethernet backhaul for more stable connections between Deco units. 
   • You can add more Decos to expand Wi-Fi coverage and fill in "dead zones". 
   • TP-Link generally recommends a maximum of 10 Deco units in a single network for best performance, especially for WiFi 5 (AC) models. 
   • For WiFi 6 or higher Decos, you can expand the system as needed. 

  @Drz13 You can either add the X10 to your main network or add it as it's own network. Not sure there is a way to link the X10 or any other deco model as a slave to another slave unit. 

Feel free to email support they might know of a way to do this. 

1. Email support at support.usa@tp-link.com.
2. Include the model number of your Deco router, as well as the hardware and firmware versions.
3. Describe the issues you are facing and send the email.