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.

(Blacklist) approach via the mobile app, newer firmware updates for some hardware versions have introduced more robust Wi-Fi Access Control Allow Lists (Whitelisting). Methods for MAC Address Filtering 1. Using the TP-Link Deco App (Recommended)

to manually enter a device's name and its specific MAC address. Save Changes to apply the filtering rules. Web Management Alternative

Even with a perfect setup, issues arise. Here are solutions to the most common problems.