Purchases are linked to the account that made them and can’t be shared between profiles. Follow these steps to restore purchases made with the same Amazon Kids+ account:
1. Launch the Kids+ app.
2. Switch the account to the Kids+ account that is linked to your purchase.
3. Launch the app and let it download completely.
4. Enter the in-app Settings Menu.
5. Tap on Restore Purchases (from the child’s Kids+ profile).
All purchase made with that same Kids+ account should immediately restore.