Because of this, you must delete your old Minecraft usernames (wherever you log into the game with a username) manually. … You may remove your Microsoft account if you play on a Bedrock edition of Minecraft and log in using a Microsoft account. Follow these steps to close your Microsoft account.
If you link a Minecraft: Java Edition account to a Microsoft Secure Account (MSA), the accounts are permanently linked, and they cannot be unlinked.
If you previously played the old Minecraft version, then you must log in to your account with your previous username and migrate to a Mojang account. You’ll need a current email address to access the password reset URL after upgrading your account to a Mojang one.
Mojang announced that it will be replacing Mojang Accounts with Microsoft Accounts for Minecraft. Naturally, this necessitates players to move over to the new account system. You won’t be able to log in to Java Edition play if you don’t migrate your account to a Minecraft Microsoft Account soon.
You can establish a unique computer user account for each Minecraft transaction you make if you have more than one Microsoft account on the same machine. Note: Each Minecraft transaction will utilize a distinct Microsoft account login. If you wish to use a Microsoft account, click Create User with Account; otherwise, click Create Local User Without Account.
