XBOX One - Microsoft Family Accounts

Solution 1:

First things first, there are, yes you correctly summarized, three things that matter and that are separate.

1. Your Microsoft account which you used with your mail ([email protected]) and which bought the Live subscription. This account can administer the family and be used to access all the neat features of a Microsoft account. These features include OneDrive, Office 365 (if bought), Outlook Calendars, and many more. One of the benefits is also...
2. Your Gamertag. This is an alias you use across all Microsoft platforms, in the Xbox Live "universe" to track your game progress (saves are stored in the cloud on the Xbox One), your gamerscore, friends, purchase history, etc.
3. Your Fortnite name which is tied to Fortnite and has nothing to do with your Xbox.

What you want to do is, on your Xbox One, log in your son's profiles. Here is how. this will enable your sons to go online and, since they are part of your family, have access to your Live subscription.

As for the Fortnite account, have you linked your Fortnite account to your gamertag? If so, you can unlock them and link your Fortnite account to a new gamertag. Progress on Fortnite (in game) is tied to your Fortnite account, not your gamertag. You gamertag only holds the related achievements.