@David-TP I have tried the steps 1. change the WAN DNS on Deco to 8.8.8.8/8.8.4.4 per How to change DNS server settings on my Deco 2. Enable "UPNP" under Deco APP>More>Advanced>NAT Forwarding>UPNP....

@David-TP thanks for reverting back on my thread as suggested i have turned off "fast roaming" and "beamforming" on the Deco still i am getting the same error My deco model : TP-Link Deco X60 Wi-Fi 6...