Basically, we need to leave room for the universal answer (God) to fit into the definition.
If we ever scientifically figure out how consciousness arises in our brains, I think we will have a bunch of very depressed people on our hands. If the truth isn’t met with flat out hostile denial. I fear any answer that doesn’t leave room for God will be rejected.
Since we have the source code to AI, and thus a Godless understanding of how it works, AI will NEVER be deemed “conscious”.