Creating family sharing
I want to add my child to family sharing. We Setup an apple id when we bought the phone. Family Sharing set up for adding the child, keeps saying the apple id is unavailable. We can log into her apple ID account, but her birthday is wrong. When we try to correct it, we get the message it can only be changed from family sharing. In the old days of may frame computers this is an "endless do loops".
iPhone SE (Gen 3)