The LED on the switch port to which the Bridge is connected is off, as opposed to the LEDs of the ports to which other devices are connected, which blink happily.
Have you tried the Network Bridge connected to another working port on your switch or router?
Have you ever set the unit to a static IP address, or has it been left on DHCP (the default setting)?
FYI, if the front LED constantly flashes it indicates that the unit is not receiving an IP address from the router. This could be because the Network Bridge is trying to use a different subnet to the router because of a static IP, or if you aren’t seeing flashing lights on the network sockets of the switch / router could be indicative of a hardware fault somewhere in the chain.
Thank you for your kind replies.
NB is not visible on my network.
I did leave it both off and on for a few hours after power-cycling.
I tried the Network Bridge connected to other ports on my switch, as well as directly to the router.
Never set the unit to a static IP address.