As of March 10, you will no longer be able to play Minecraft: Java Edition with a Mojang account. ... and they're enticing people to make the change with the promise of free Minecraft capes.

Make sure you're using Minecraft: Java Edition. ... If you're not logged in with the account you used to purchase Minecraft: Java Edition, ... Click the "Agree and start free download" button.

Upon migrating, players also receive a free in-game Minecraft cape. When you migrate, you will still be able to use your name from your Minecraft Java account.

In a post on Minecraft.net, Mojang Studios gave a detailed overview of the decision behind the account migration and clarified that it will be mandatory for all users starting in 2021 - players ...