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Hello, thank you for reaching out to Microsoft Q&A.
Microsoft takes account security and privacy very seriously. This means that account recovery issues are handled entirely through automated processes, such as the Account Recovery form. Microsoft does not involve human agents in the account recovery process. So,
In this situation, I recommend that you continue trying the Account Recovery form. However, it appears that you last signed in to your child’s account about two years ago, which may make it difficult for the automated system to verify your information if the answers you provide to the security questions are not accurate or are hard to remember due to the time period.
While it might not be the outcome you are looking for, if you’re unsuccessful in recovering your account, then you will need to create a new Microsoft account. You can do that by clicking this link: https://signup.live.com/