As you may or may not be aware, Minecraft will require the use of Microsoft accounts starting the 10th of March, 2022. If you've not yet migrated your old legacy/Mojang account over to a Microsoft account, then you'll lose access to be able to login on March 10th, 2022. For more information and instructions on how to migrate, please see the Minecraft.net blog post about this announcement or visit minecraft.net/move.
As of last night, Minecraft accounts may now be migrated to a Microsoft account. For this feature to work, you'll also need to login to your "legacy" Minecraft account and immediately update to Minecraft version 5.0. Accounts should no longer be migrated from Microsoft accounts back to legacy Mojang accounts.
Be sure to verify your password after migration to ensure you have access to your original legacy account. Once you've successfully migrated your account, you'll find a link in the top navigation menu for 'My Minecraft'. Clicking on that link will open a brand new Minecraft experience that has been customized for you. We hope you have a great experience and welcome you to Minecraft. If you have any trouble with the migration process, please contact us in the Support Forum. d2c66b5586