How can I fix my account being blocked in order to create a child email in my family account?

[Windows 10]

I am trying to add a child to my family account. I already created one child account but am having trouble with creating my 2nd child's account. I can go through most of the process of creating the account but after putting in their birth date, I have a message telling me there is suspicious activity and I've been blocked from making a new account. I've tried 5 times, read articles, and troubleshooted in multiple ways including clearing cache, logging in with a different browser. Please help.

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