Hi, I have a question about free 15 childcare code. I received the code and ask childminder if she has a space for my son, but she said that first need to check if code is valid because period is closed and council will not pay and she will accept my son on April when period will be opening. (My son received the code before 13 January I should reconfirm it every 3 months, why code would be not valid, why need to check it i don't understand ), please help me out, thanks