Samsung One SolarCell Remote with Sonos Playbar but via ARC Audio Extractor/Converter

[MiniEmma]

Hi all

We just bought a lovely S95D and all was well.  Once I discovered the Universal Remote settings on the TV and just clicked Yes to the Power Off question I even had the One SolarCell remote working the volume on my old Sonos Playbar that was connected to the One Connect box via Optical cable.

BUT we noticed terrible lip sync issues when watching on our Sky Q box but the delay was the wrong way around for any of the delay settings to work. All delay settings just made it worse.  Googling seems to show this is a known issue.

SO we bought an Optical/HDMI converter, plugged the optical from the playbar into it and then it into HDMI 3 eARC and the lipsync is much better but I can no longer find a way to make the ONE SolarCell remote to work the volume.

I've tried all sorts of configurations in the Universal Remote settings but I am unsure whether to choose Optical or HDMI 3? I have tried both.

When I click volume up or down the volume 'logo' appears on the screen and is labelled Audio System (HDMI) and the + and - flash when I click the corresponding button.

From researching, I think I just need to get the remote to use IR.

I've even tried adding it in the Sonos app but it doesn't recognise any button presses.

I'd really like to use this remote, it sits nicely in may hand and I never used the weird remote that came with our last Samsung in 2012, had a touchpad or something, such a waste.

[MiniEmma]

Another quick update: 

I deleted the Sonos from the universal remote setup and then reset the One Remote so that it's no longer outputting IR. At this point the Sky remote and standard Samsung remote are working properly. 

I then re-paired the One Remote with the TV and added Sonos back to the Universal Remote setup and we are back to the other 2 remotes double clicking the volume and mute. 

One Remote still not outputting IR and the issue still exists with the One Remote in another room so the repeater idea was a red herring it seems.

Does anyone know where the TV or One Connect box outputs IR?