Kids cant accept Spartan Company invite

I recently started a Spartan Company and i was able to add several friends. The issue is i sent my kids an invite for the Company and for some reason when we go into their accounts to accept the invite the notifications and message tab seem to be missing. How can i add the kids to the spartan company?

Here you go:

> 2533274813317074;4:
> Hey guys, there is actually an age restrictions associated with Spartan Companies - it’s related to your Microsoft Xbox Live account. For privacy reasons child accounts and teen accounts are restricted from doing certain things, to do with COPPA and data protection. On Waypoint this means that those accounts cannot access the private message / inbox feature and thus will not be able to participate in Spartan Companies until their account can be promoted.
>
> You can check the links below on the Microsoft site for some more info:
> http://support.xbox.com/en-GB/xbox-360/security/promote-child-accounthttp://support.xbox.com/en-GB/my-account/security/child-account-definition