How to complete mandatory migration in Minecraft Java Edition

Today is the final day for Minecraft players to migrate their accounts to Microsoft. Mojang has been asking players to migrate their accounts to Microsoft for a long time and today is the deadline.

Minecraft Migration Cape bug

Minecraft Account Migration Deadline Set for March 2022

Cannot play Minecraft Java Edition after migration - Microsoft Community

From Mojang To Microsoft: Players Required To Migrate 'Minecraft' Accounts Until March 10; Here's How

Microsoft's Next Big Idea for Minecraft: Mandatory Microsoft Accounts

All Minecraft games will soon require a Microsoft account including Minecraft Java Edition

Microsoft Account Migration Authentication - Free Coin Boosters!, Page 10

Unable to login to Minecraft Java Edition after account migration - Microsoft Community

You won't be able to play Minecraft Java Edition after THIS date; find out why