Hello all, tried setting up my hub three today using the chord that was already in the wall. Socket looks like this:

The isolator is removable and looks like this

My red power cord also has a stuck out pin, so they don't connect. Nor does it connect the isolator that has a stuck out pin. I purchased these connectors with female ends
But when I connect I still get the green flashing light and no wifi so maybe it's the connectors fault? But then how do I connect it! Am I even using the right wall socket? I have an NTL phone line next to it and a BT open reach 5G plug in kitchen that I also suspect is no good. Please advise asap!!!! I have a hub three.