Thought I’d share this in case there are people who are unaware or have been pending off the migration process.
Starting September 19, 2023, at 11:00 am EST/17:00 pm CEST, unmigrated Mojang accounts will not be able to sign in to Minecraft.net or the Minecraft Launcher to migrate. We’re doing this to ensure that everyone is playing using accounts with improved security and player safety.
Source: Minecraft.net article
What will happen to unmigrated accounts?
Once the deadline for migration is reached, players will no longer be able to access unmigrated accounts. All unmigrated accounts will be deleted at a future date.
Source: help.minecraft.net
What if you don’t have access to the email address associated with your Mojang account, or have any other queries?
The details are unclear. The Minecraft help center link says “Minecraft player support will no longer be able to help with migration-related issues after September 5, 2023.” whereas the minecraft.net article states “[…] starting September 19, 2023, Minecraft Support will no longer be able to assist in any MSA migration-related tickets.”
What do you get for migrating to a Microsoft account?
Microsoft claims improved account security, and 2FA. You will get a Migrator cape and access to Minecraft for Windows (Bedrock Edition) on the Microsoft account chosen at the time of migration.
Man, I’d prefer to have this account on my Xbox account but it won’t let me migrate since I have a different Minecraft account there already. Wish it would just let me throw that one away and link this one in.
You will have to request Minecraft Support to delete that existing Java Edition profile from your Microsoft account. Once they do so, you can migrate your Java Edition profile to it. I’m assuming their support’s pretty hammered right now, so I’m not sure if they will get back to you in time.
The easiest thing to do would be to choose a different Microsoft account to complete the migration, despite the inconvenience it might cause later on.
Migrate it to your child’s/spouse’s Microsoft account if you have one. If you’re feeling extremely generous, migrate to a friend’s Microsoft account. You can then swap usernames between the accounts at a later date.