reset and lost xbox 1 secondary profile

I have no idea where to post this or who to ask.

my child decided to reset my xbox 1

I have 2 user profiles on it

the first is my main account that I remember and use

the second was set up for my 10Yo and I only remember parts of his screen name and I do not know the email or password associated with it

only my Main account

is there a way to view the info some how on the xbox one or how to do from my main outlook account?

all his games are there with my main account but not the saved data.

only on his account

Thank you