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@PhilDAS
I have put a new Ultegra R8050 Di2 groupset bike together.
Initially the whole thing was just dead, no lights, no movement, nothing.
I have left shifter wired to right shifter and right shifter wired to bar end jA. I had the wire from jB to the left shifter when nothing worked. Swapping it to the right shifter made the whole thing come alive.
Now. I have no shifting on the front mech still.
As I shift the rear up and down the cassette, the front moves a little as it should for trim or chainline or whatever so it is connected properly and the system recognises it. So I thought it must be the shifter, unplugged and swapped in a known working left shifter but still nothing. Tried a different wire between left and right shifters, still nothing.
I have it on charge in case it's just that but I thought new batteries ship with a decent charge.
Any ideas? Is it fussy about how it's wired up? I was surprised when it didn't work with the jb wire in the left shifter but fine in the right.