signing into Minecraft with Microsoft account reveal the email address?

Hello, first it's a pleasure to be able to help you today.

My name is welcome to the community.

Hello OilSud, in the Microsoft system will not appear, however it would be good to check how nintendo's system works and what permissions the system offers, ideally consult nintendo's official website regarding the accounts.

https://en-americas-support.nintendo.com/

In your Microsoft management account, you can see that you've signed in to your device.

https://account.microsoft.com/

Sign In then do Settings | Account | -> -> Account Security | Change Microsoft Account |
fib and tell it you have a new adddresse | and your email addresse is revealed on the right side on the grey box

Also to note, they have their own Microsoft accounts. I just need assistance in linking the correct Minecraft profile to the correct sign in email address.

If you signed up for Minecraft Earth on the website, then you would receive a code in your email address of the Microsoft Account you used to sign up. The code would be in the email, not your Xbox profile. So make sure you signed up with the right Microsoft
Account, and check all the emails associated to that Microsoft accounts, including Junk or Spam folders to make sure it wasn't sorted incorrectly.

Knowing the email address is the most important thing to recovering your Xbox account. For security reasons, not even customer support will reveal the email address.

Look here on the
Forgot the Microsoft Account Email Solution and prepare to do a little "sleuthing" to figure out what that email address was. Consider also checking your personal files, records, or other email inboxes to see if anything has any relation to that old email
address.