Need help getting my brother's profile back

Your brother would have to follow the steps here to find out his password
support.xbox.com/.../lost-password-solution

Details on how to recover the email address can be found here
http://support.xbox.com/en-GB/my-account/microsoft-account/forgot-microsoft-account-solution

This is something your brother would have to do for security reasons.

I'm having this problem too. 6 years of playing and then you suddenly have to remember an account password you haven't used in 6 years or the details for the account you signed up with in the first place. It's strange that you can't sign on offline with
a gamertag unless you sign in with the microsoft account as well. I currently cannot use my xbox console at all, because i can't prove I'm me, which is doubly strange, as i'm paying for the service in the first place.

Having the same issue here Got in touch with Xbox Support and the operator I got in touch with made a personal case with Microsoft. Long story short, I'm waiting for a reset code from them, but I feel like I'm getting ignored. I've been using this account
for years and for the first time it asks me to sign into an account that I don't remember the password for. All these years of playing and achievements down the drain?!? ...

Hi Polat,

It looks like you were able to get in touch with a supervisor today and they've already passed your case up to an Advocacy team for further investigation. That team will be best equipped to look into the account weirdness you're experiencing. They should also
have given you a time frame to get back in touch with you.

Please let us know how things go once you are able to get back in touch with them.

Yes i spoke with them today and agreed to apply to change the microsoft account linked to the xbox live profile. Although this will be the second time dealing with the advocacy team and i wasnt so nice to them last time haha. I'm still extremely puzzled
by how they still can't understand it's me!