Able to "dupe" indefinitely Minecraft profiles with Gamepass

How to reproduce:

1. Have an MSA with Game pass that can access Minecraft Java.
2. Download the new Windows 10/11 Launcher from the MS Store (https://www.microsoft.com/store/productId/9PGW18NPBZV5).
3. Open it and go to "View all accounts" and click on "Switch account"
4. It will open the Xbox app prompt, click "Change account"
5. It will then open the Windows account picker, choose "Use a Different account - Microsoft"
6. It will open the Microsoft login page, create a new account and pick a gamertag.
7. Then the launcher will use the Xbox account you just created. Go to the Minecraft Java tab and click "Play".
   If the Launcher shows something along the lines of "You're not signed into MS Store with the account you're currently using in the launcher", you did it correctly.
8. It will ask you to create a Minecraft profile and input a new name for the profile (this is the Minecraft username).
9. The profile will be successfully created, and the game will launch.

 

This newly created profile is a totally valid one that can join online mode servers, and also will show up in sites that query the Mojang API (like NameMC).

 

Must be noted that if you switch your account in the Microsoft Store the launcher will show the "Play Demo" button instead but switching back to the account that has GamePass in the store will let the new account play the game again.

 

This seems to not have a limit, as I did it twice with two newly created MSAs.