I’ve managed to get it working now, cold booting whilst docked seemed to worked - I tried it multiple times and on the fourth go it worked. So currently VRR is working when directly connected to my TV, I’ve been trying the same methods to get it working through my receiver but not having any luck.

I am having the same issue as OP with and LG OLED (C1) and have tried the above tips - but I still can’t get VRR to work