@MojangSupport Hi! I'm having difficulty migrating my account :-( My brother made it for me in 2011 and I still know the username and password but neither of us remember what email he used. This is a problem obviously because that's where the transaction ID that you ask for went.
Please submit a request to us with an email you can access, and confirm as much info about your account as possible (possible email/username/transaction ID/purchase date/etc). You can contact us here https://help.minecraft.net/hc/en-us/requests/new … and we will assist as soon as possible. ^SA