My Puppy Refuses To Poop On His Piddle Pad!?

Hi!
I have an 11 week old male cockapoo that we are piddle pad training. He got down the piddle part within just a few days and only piddles on the pad. He won’t poop on it though! We have him sectioned off in the kitchen and he tends to go behind his crate or in front of the door that leads to the garage. The 3 times he did poop on the pad I praised him and gave him treats then next time he would go it would be on the floor again! When he’s gone on the floor I have scolded him and even picked up the poop and put it on the piddle pad so he would have the scent. Nothing works please help with suggestions! I’ve googled this and can’t seem to come up with any answers, thanks!