Cannot Send Messages - New Account

update- all accounts on this console will not work. I created a new account and downloaded a friends and I am getting the same message every time. It will not let me play on Xbox live and it will not allow me to send messages. Even on the new account
it says due to past behavior you cannot send messages? Is my console blocked or something?

Hi there,

We're sorry to hear about this experience as the accounts should mirror each other. We're glad that you were able to figure out the root of the issue and we're even happier to hear that your child will now be able to communicate with their friends. Happy
gaming!

I finally managed to fix this issue on a hunch. I logged into my Microsoft (adult) account and the child account.. Note: NOT xbox live profile, but Microsoft accounts.

On the top menu, select 'Your info' which is between 'Account' and 'Privacy'.

Next, click on 'Edit Country/Region'.

Even though the MS support pages say that some of the information is optional, make sure you fill in every field, dob, gender, country/region, county and time zone. Do the same for the child account. Now recycle the xbox and login with the child account.
Messaging and invites is now working.

This was for a child account who was new to the world of xbox and never sent a message before. Hence suspensions and enforcement did not apply. This is a bug, and a bad one, as it prevents enabling child accounts to use the platform safely. I can guess and
understand why some people let young children use adult accounts. The support was worse that awful. I wasted two days trying to get advice from Microsoft under terrible channels, text chat, akin to cutting my lawn with a nail scissors. Professionally, I moved
away from Microsoft OS to Linux almost 20 years ago. They still have much to learn, but I am happy to post this text if it help other parents.

Just to add to this post. I managed to get support from an Ambassador. I was instructed that child accounts are not allowed to send messages over xbox live, even with friends. When I challenged this based on the considerable and comprehensive family protection
developed by Microsoft for child users I was told to read the Microsoft’s Code of Conduct Explained for Xbox Live Customers https://www.xbox.com/en-US/legal/codeofconduct

Sending messages for the child account still an issue.

Hey there Owlbearchampion.

To start things out, are you posting from the newly created account or is this a different account? Have you had a chance to check for Enforcement action over
Enforcement.xbox.com?