@Marvin_S This is probably not about POE (powering devices over Ethernet), but about PowerLine (transmitting data over the power network).

@Mart18 Do you intend connecting one powerline adapter to the switch, and another powerline adapter to the remote Deco?

@Speed7 This might help.

@Bar666xp You can link IP addresses to MAC addresses. Does you third party mesh act as an AP or as a Router? If it acts as an AP (no NAT), the Deco will see each device as coming through wire, and...

@neilbaker86 Is the wifi active on the Virgin media hub? If yes, do you have same issue when you disable it?

@cgarry The backhaul should automatically use all available bands. The app shows, in the details of each satellite Deco, the bands actually used.