Just try again with a small batch in a week. I had the same issue with week old chicks. They took to it after about two or three weeks.
x2. My chicks wouldn't touch it at first so I fed it to the hens. After watching the hens get their bonus breakfast over and over the chicks finally decided to give it a try, and then after that they were sold on it.
Keep initial batches small because you don't know when they'll finally be willing to eat it. Always easy to make big batches once they're willing to eat it.