I have a MESH (BT Whole home wifi) system and was told that you are only considered to be "at home" on wifi when you are connected to the same wifi disk/mesh device as the Inverter, which is a bit rubbish imo.
So I tried adding ethernet a while ago and changed the DIP switches but I can't connect via ethernet. There's a strong chance it's because I did a bad DIY job crimping my own RJ45 connector because it's not possible to get one through the cable duct, but I've not got round to testing this theory yet. Capt_Rich I guess it's possible I have the same LAN issue as you? How was yours ultimately diagnosed?