Update your child's Windows 10 device to get family features to work *not working*!

Check your version of Windows: Start > winver

The latest version is 1909 as of this date.

If you are not on this version then run the updater and let it finish: https://www.microsoft.com/en-us/software-download/windows10

Once updated log in and "verify" the account again.  Have a look at one of the posts above and it will tell you how to verify the account.

Reboot, log in again and give it a while to update back to Microsoft Family.

This resolved my issue and for a few others on another thread...   :)

Ok - Ive thought this out a bit and come to one possible idea of what MSFT's bug is.   

Of the accounts of children who are working in families with multiple children,  were the accounts of the children whose accounts can be controlled without that bogus error, ORIGINALLY SET UP AS CHILD accounts?

Were the account(s) that dont work originally setup as ADULT and you chnaged their birthdate to be correct which made them a CHILD????

Hi Rob

My name is Andre Da Costa; an Independent Consultant, Windows Insider MVP and Windows & Devices for IT MVP. I'm here to help you with your problem.

It would suggest one of two things, the account if a Family Account or the NTUser.dat file is corrupt. This is also an issue many users have been reporting for years now, but there isn't a definitive fix.

I would also recommend you file a bug report; send me the short link so I can vote on it and bring it to the attention of the Windows engineers.

https://windows10.help/blogs/entry/54-how-to-su...

Information in the above link is sourced from a trusted Microsoft MVP blog.

If you are on social media, you can also let this engineer who works on it also know about the issue.

Troubleshooting steps:

Step 1:

Change the date of birth on your Microsoft Account to ensure it reflects your are 18 years or older:

Change the birthdate on your Microsoft account - Microsoft Support

https://support.microsoft.com/en-us/help/12411/...

Step 2:

If the other account is setup as a family account, sign into your Your Family at the following link:

https://account.microsoft.com/family

Under the account, click More options, click Remove from family.

Restart then check if you can sign into the account again.

Change the account privilege

It is possible there is a profile issue, you could try changing the account privileges to Standard User from Administrator to see if it logs you in.

In your current account

Press Windows key + X

Click Task Manager

Select the Users tab

Select the account, then click Disconnect

Press Windows key + R

Type: control userpasswords2

Hit Enter

Select the other account

Click Properties

Click Group Membership

Select Standard user

Click Apply then OK

Click Apply then OK again

Restart the machine, the try logging into the account.

If that doesn't work, then it suggest NTUser.dat might be corrupt.

Open Start, type view advanced system settings

Hit Enter

Under User Profiles, click Settings

For the affected profile, click Delete

Select your user profile or another user profile that is able to log on successfully.

Click Copy To..

Click Browse then save it somewhere on your drive

Rename it to something else

Open File Explorer > This PC > system drive where Windows is installed

Open the Users folder

Open the troubled profiled

Go to the View tab, then check off Hidden items in Show/Hide

The NTUser.dat with backed up earlier, copy it into this folder

Restart, then check if you can log in.

Same issue here.

I removed my child from the family and from the PC.

Then re-added to family and PC.

Problem persists.

My other child account works well on the same PC. Very confounding.

Hi Andre,

Thank you for your detailed response. 

There are a few aspects of my Microsoft Family account that failed to mention in my original post, and that may be pertinent to my situation.

• I have an existing Microsoft Family account with myself and my wife as adults and my 13-year-old son as a child.
• There are currently three other devices associated with my child's account: Windows 10 Professional (64-bit) custom-built desktop computer, an Xbox One, and an Xbox One X. All three of these devices work as expected with Microsoft Family settings.
• The laptop I mentioned in my original post is a new Lenovo Flex 6 14 Series 2-in-1 Touchscreen Laptop. The laptop had Windows Home pre-installed.
• After creating my user account (using my Microsoft account to login to the Lenovo laptop), I upgraded the laptop to Windows 10 Professional.
• Once Windows 10 Professional was installed, I performed all available Windows updates, bringing it to version 1903 (May 2019 update).
• I am able to login to my user account (an Administrator account), and administrator group functionality appears to function correctly on my account.
• The laptop did not have any third-party AntiVirus or Security software installed. I have an active BitDefender subscription with open PC spaces and planned on installing BitDefender once the laptop was functioning as expected.

I'm reluctant to remove my son's Microsoft account from my family group, because I do not want to inadvertently reset parental control settings that are active and working correctly on the other three devices on the account.

Since my child's account has only existed on the laptop for about one week, rather than replacing the NTUser.dat file with a copy from another user account, I decided to remove my son's account from the laptop, including the entirety of his user directory. 

However, even after removing his account and recreating it, the same problem persists. (I did not scrub user accounts from the Registry, so if there are account settings in the Registry associated with his UUID, then it is likely that deleting his account from the computer did not flush out whatever datapoint is presenting Windows Family from properly working with the Lenovo laptop. 

My next step at this point is to try using a copy of the Default user's NTUser.dat file to see if that resolves the matter.

If that does not work, I am thinking of adding a local administrator account unassociated with any Microsoft.com account. From that account, I can then remove all other user accounts, including the inactive/hidden ones that are automatically added when adding an account with Microsoft Family group.

I will post an update once I move forward.