The Deco M4 firmware does not currently support a strict whitelist mode to block all unknown devices automatically. Alternative Deco Features for Better Security
Knowing this can help me suggest the best or privacy settings for your setup. Share public link mac address filter on tplink deco m4
The Deco app interface does not have a simple "Add MAC Address Manually" button in the Blocked List menu. You must use the Network Map feature via the web interface. The Deco M4 firmware does not currently support
Note: Make sure your current phone or laptop is added first, or you will accidentally lock yourself out of your network. You must use the Network Map feature via the web interface
You can manage access control directly from your smartphone using the official TP-Link Deco App. Method 1: Blocking an Already Connected Device
Remember to disable random MAC addresses on your personal devices, always add your current phone to the Whitelist before activating it, and use the Blacklist only for temporary blocks. By following this guide, you transform your Deco M4 from a simple mesh router into a fortress-like access point, granting entry only to the devices you explicitly trust.
MAC Address Filter on TP-Link Deco M4: The Ultimate Configuration & Security Guide