I spent 1.5 hours on chats and the phone with
amazon about this today. I have many orders that hinge on getting the airmiles and if I will not get the airmiles that why wait for black Friday multiplier and risk things being out of stock or the website crashing (reality). The best answer that I finally got was this.
On the search bar on amazon.ca, make sure that the far Left side of the search bar shows all departments. As soon as you type in your product a drop down menu will appear, under your item it will say the category. It seemed to work for me. I hope this can help us all stumble our way through these crazy rules