Feeding thin syrup (about 45% white sugar by weight) provides fuel for comb drawing.
However feeding excess (and/or excessively strong) syrup will lead to it being stored (rather than consumed immediately as fuel). And excess stored syrup, occupying comb needed for brooding, will end up with premature swarming.
Getting the bees to recognise that there is good stuff in the feeder can be a pain.
New kit doesn't help!
One thing I do is to pick an appropriate sized, stiffish leaf (I have a few Bay trees in the apiary) and dipping it in the syrup, paint the feeder cone with syrup before using the leaf to drip syrup down the walls of the 'throat' of the cone - and finally pushing the syrupey leaf into the throat, ideally right down to touch the frame topbar beneath (thus providing a direct ladder into the feeder, bypassing the dead-end of the underside of the cone.
/// My preference is to have only a small round hole in the feeder board, to match the 'throat' of the feeder (blanking off the underside of the cone). It means positioning the feeder exactly, so, once correctly positioned, I draw round it with a marker pen, making it easy to reposition it accurately.
