Hi @Dahumph
Welcome to the Sonos Community!
Please note that as Sky Glass does not have an optical output, it is not ideally suited for use with the Sonos Playbar.
It sounds like you have fitted an audio extractor to the HDMI cable of an input device - please note that even if you get this working, you will not be able to get audio originating from the TV (like Sky channels) through the Playbar.
If, however, you have fitted the extractor to the TV in the hope of getting HDMI-ARC audio outputted from the TV to go the optical connection, this is unlikely to ever work as the extractor would not typically be looking for audio on the HDMI-ARC wires on the HDMI cable.
I think what you really need is a soundbar that supports HDMI-ARC, like Beam (Gen2) or Arc (or a TV that outputs to optical).
I hope this helps.
"Common sense is the collection of prejudices acquired by age eighteen." - Albert Einstein