@Marvin_S Hi Marvin, thanks for the reply. i have called tp link hotline and managed to resolve the issue. Some how the deco is not able to work with my fibre ONR. Issue is resolved once i changed...

Replaced my singtel wifi mesh with Deco X50. Did as per recommended set up, dynamic IP and IPTV mode to Singapore-Singtel. However deco is still solid red.