@MojangSupport I emailed you, and the email I received back wasn't helpful at all. When I try to migrate my account, it says that it has already been migrated. But when I try to send 'forgot password' to my email address, I receive no email.
For information on how to locate your transaction ID, or recover it if you no longer have it, please see https://help.minecraft.net/hc/en-us/articles/360029977371-What-is-a-transaction-ID- …. ^TM