What is knockout feed? Are you feeding a source of Calcium. Oyster shell is a good source and so is their used egg shells. Just smash them up and bake them at 350 for about 5 mins. Watch them closely they will burn. Then I grind them fine in a small chopper ( one for onions or nuts in cooking) and feed them back to the chickens. I put them right in their feed. Are they eating, drinking and pooping ok. Any seem sick, lethargic or just sitting around. I feed 20% protein along with mealworms ( high protein) also. Eggs are mostly protein. We and our chickens are what we eat. Protein in Protein out. Their egg factory requires protein. Also, possibility of being egg bound. If they haven't laid in 2 weeks that's unlikely. They probably wouldn't be here. Also, chickens lay only so many eggs a year. Say 200 just for easy math. That leaves 165 days they don't lay. Some times that's a day or two here and there but it might be a longer stretch.
Good luck.
