How do I recover an account that was converted to a Google "kids" account and immediately blocked?

Question

I have created an account for my 9-year-old girl. Then I found out that creating a kids account was possible. So I tried to convert that account into a kids account by modifying date of birth, When I did so, Google asked if 9 years old was correct, I said yes, and immediately, the account was blocked. How can I prove I created this account and how do I recover it? Who to contact?

Answer 1

If age is set on less than 13 years, an account will be blocked and deleted in the next 30 days.

https://support.google.com/accounts/answer/1333913

To recover such account you need to set up supervision:

https://support.google.com/families/answer/9055704