I want to add multiple Minecraft accounts

Currently, when trying to add multiple Microsoft accounts the launcher will not allow 2 or more Microsoft accounts, this is due to a bug in the launcher integration with Microsoft. We are working on a fix to this issue.

This is due to be fixed in the next update

Failed Microsoft Authentication

If you see the error Failed Microsoft Authentication and you are sure you entered the correct details then it’s likely your Microsoft account is registered as a child account, with a date of birth under 18.

Microsoft does not allow private clients to access Microsoft user data of under 18’s however, if the age on your account is incorrect and you are over the age of 18, you can modify your date of birth on https://microsoft.com