Raspberry Pi 4 Installation Sucessful, but refuses to connect to the network

So I have managed to install HA on my Raspberry Pi 4 Model B, but after tryng to find it on the network, I plugged in a monitor and found that tne installation does seem to be installed and running, but when I go and check the network settings from the command line interface I see that there is no network settings picked up via DHCP, I then tried to set fixed IP details but these are also not working.

Any help and guidance greatly appreciated.

Is your ethernet cable and port OK?

I have tried alternative known good cable in a different port.
I am also using the Raspberry PI with a PoE hat for power.