Hello, good day and thanks for your question. Sorry to know about this and I understand that you are looking into finding out on which Microsoft account you have migrated your Minecraft account to.
Please check the information below including the link for it which also includes the sign-in helper tool.
- Look up your username using your security contact phone number or email address. Search
- Request a security code to be sent to the phone number or email you used.
- Enter the code and select Next.
- We'll then show a hint of the username, in this format: j******@outlook.com** Tip
- A phone number or other email address may be used as sign-in security information for more than one account.
- If you don't recognize the phone or email hints, read My username and password have stopped working.