Hello, this is Emily.
Can you confirm if this is how you added your child's user in Windows 11?
Settings > Accounts > Family, click on the drop down next to your child's listing and choose "Allow sign in"?
If that's not how you did it, you will need to do it this way.
If you've done it that way but it won't sign in, there are two things I would like to review before we move to potential solutions:
- Hold down Windows + R keys, type in netplwiz and hit enter, when launched, does it list your child's email in addition to yours?
- Hold down Windows + R keys, type in sysdm.cpl and hit enter. Then go to Advanced tab, click on Settings button at the User profile secton. Does it list anything that looks like your child's user profile? Can be just the first 5 letters of your child's email address.
Let me know.
Thanks!