I disagree with the argument that consciousness is physical simply based on the fact that the physical substrates which give rise to the conscious experience are correlated but not causal. They're called the neural correlates of consciousness for that very reason. Yes one can argue that dopamine causes pleasure, but pleasure is not a physical thing, it's a subjective inner experience. We have no idea how dopamine causes pleasure, all we know is that increasing amount of it gives us more pleasure. If you want to invoke the principle of strong emergence, then you are basically acknowledging that matter can give rise to completely novel properties in nature never seen before, aka magic (I mean Gandalf/Harry Potter magic, not the illusory kind). And one can argue that strong emergence is a form of property dualism. The conscious experience is completely different from the physical substrates which give rise to it.
There are no colors, no sounds, no feelings, no emotions and no meaning in physical reality. And these are all irreducible. Red doesn't break down into smaller red. Most people who support dualism (whether it be property or substance) don't deny that the brain is intricately involved in the creation of consciousness. They're simply saying that the experience itself is not purely due to the brain, that there is another property at play here and that property is perhaps another fundamental layer of the universe we haven't come across as of yet.