Just a guess (I don’t know how you’ve been preparing the f/t prey) but maybe your bp doesn’t recognize the f/t rat as food because the rat is too cold? Back when I first got my bp, I had trouble getting him to actually strike and eat until someone here suggested that I heat the prey more.
I would suggest letting the prey thaw on top of her or enclosure if possible so that she can smell it ahead of time. After it’s thawed all the way through, you can submerge it in some very hot water for around 30 seconds, or blast it with hot air from a hairdryer for the same amount of time. This is the method that worked for me![]()