Does the Rolex service center provide watch authentication still?

I don’t think that’s possible anymore.

Before, you could leave the watch there for them to assess for servicing and provide a service quote.

If they quote you, means indirectly that would confirm its authenticity. If they returned it without providing the servicing quotation, it would probably indirectly means is a fake.

Not too sure now can or not, I think now can’t Liao

Not quite sure that’s possible.