Why is there a iClout that I don't own on my Xbox account

Hello B0tter, this is Manuela!. I'm an Independent Advisor and community user like you ready to assist with this.
Not a Microsoft employee.

If you think that someone accessed to your account please verify if all your security information is up to date and remove the email addresses or phones you don't know.

You can do it from here:
https://account.microsoft.com/security

May I know if you are able to do it?

Hi WattyNuela, to respond to your reply, I tried what you told me but now my account does not exist? If you know what's going on please tell me! Thanks.

Hello B0tter, that's unfortunate to know. Reviewing your reply, it seems that your account was compromised.

You can try to recover it using the Microsoft interactive guide below
https://support.microsoft.com/account-billing/h...

I just don't understand why I was able before to create an Xbox account and choose freely my gamertag and still have the free name change available.
If everyone is supposed to get a generated Xbox account ID, why was I able before to create a Xbox account and create my own gamertag and still have the free name change available?

when I use my account, if it's a name that's not taken there is no numbers, so I don't understand why he can't have his name MothyMoss, since he owns it, because I don't think it's taken