The question is whether the computation that goes on in brains causes consciousness or not.
What we know is that when computation in brains ceases (as when under general anaesthesia when we can no longer think or perform arithmetic operations) consciousness also ceases. Therefore computation must play an important role in consciousness.
Brains and computers do things differently. But their processes are analogous and they both achieve similar outcomes. If intelligence is XYZ, then computers already exhibit X. If intelligence requires consciousness, then there is no reason to think that, once computers can achieve X,Y and Z they will not also acquire conscious.
The “impossibilists” and Mysterians dislike this idea. But that does make it untrue. It must be possible in principle to build computers with a complexity that matches human neuronal networks. If/when that happens, there is no reason to think that computers will not be conscious.