A demaree isn't guaranteed to produce queen cells in the top box. Perhaps the queen pheromones are still sufficiently strong in the top box that the bees feel no urge to make them, or perhaps there weren't any suitable eggs/larvae to make them from.
Have you used a demaree board ?
Some times they will rip cells down I’ve found .
As others have said if the queens pheromones are strong they won’t bother, if you use a demaree make sure the hole with qx over it is only an inch or two.
Another thing to do is when you perform a demaree put a sheet of news paper over the first brood box then the qx supers brood box with all the brood .
It's never guaranteed to get QC's - even with a Demaree board
In fact I've noticed that this year especially, many Demaree'd colonies aren't making QC's in the top box.
Also, you will often struggle to see QCs on day seve, but on day eight/nine a few sealed ones just pop up from nowhere!