I only received my new XC40 a week ago and have joined this forum with great interest. Having read this about headlamp washers I tried mine and also thought mine were not fitted as detailed in the R Design Pro specification.
HOWEVER, digging into the Sensus manual (not the supplied booklet) it states that the headlights must be switched ON. So I switched them on (they were in auto) and out popped the washers!
Hope this helps and do let me know if it does!