Deck to LG TV - Feddit UK

I feel a bit sheepish having to ask this, but has anyone successfully gotten their deck to display on a LG TV (C2 to be precise)? I have the official dock and that works for other devices like my laptop or surface pro but no dice with the deck itself. I’ve tried various things like resetting the device, resetting the dock, changing the order of connection them all up but not managed to get anything to show it. I also checked that the HDMI cable I’m using works for up to 8k. A bit frustrating as one of the reasons I got the device was to be the living room PC/link to my gaming PC!