@TP-Link_Deco > Some managed switches have an option to prevent loopback traffic in the network. When Decos are connected to the switch, they will maintain the Wi-Fi backhaul until the Ethernet...

yes I did the same. disabled on only on the port that the slave Deco M5 is connected. Switch was disabling it as an "alternate" RSTP port as I think it thinks a loop has occurred. Probably received...