Freehub silent after service
This is common and not really controllable by the mechanic after freehub service. As long as it's engaging without issue it's fine. The click will work its way back eventually. Thicker lubricants cause more of this but it depends on the design of the hub as well. If too much lubricant or something too viscous was used, that's its own problem, but quieting the pawls down isn't necessarily an indication of that.