Hi,
Sometimes this is due to a glitch.
- Please make your child go to https://aka.ms/familyverify and follow the on-screen prompts. This verifies the connections.
- Ensure your child account is set to standard instead of Administrator by going to in Settings > Accounts > Family and other users, from your account.
I hope this information helps. If you have any more questions, don't hesitate to reach out.
Otherwise, if your problem is resolved, please take a moment to rate the answer. Wishing you good luck!