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Hi there!

Could you answer few questions regarding this issue, it will help with the investigation: 

• Have you tried to install older version of the Launcher from the minecraft.net website/MS store (Windows 7/8)?

• Are you logged in in both Xbox app, MS store, and Launcher with the same MS account? 

• Have you tried signing out of all your Windows Apps, and the signing in again?

• Is your Windows and associated apps (Xbox app, MS store) up-to-date? 

• Do you have enough free space on your disc drive?

• Are you sign in on Xbox Companion App?

• Have you tried downloading 'Xbox Identity Provider' found here https://www.microsoft.com/en-us/p/xbox-identity-provider/9wzdncrd1hkw#activetab=pivot:overviewtab (or in MS store)?

• Do you use VPN or any of the incompatible software on machine you try to log-in?  

• Could you provide us with more in-depth repro steps? 

Also please try this:

Check for updates on Windows Update, update everything including optional/additional updates.

1. Logout from Xbox app and Microsoft Store app

2. Look for the Xbox app and Microsoft Store app in the Windows menu, right-click, click app settings and then click terminate, restore and reset. Do this for the launcher too.

3. Clear the store cache type ''wsreset'' in the Windows bar, run as admin, and wait for the screen to close and open the store automatically.

4. Open the Microsoft Store app, click on the 3 dots in the upper right corner>downloads updates>get updates and update everything.

5. Restart your PC, log in to both apps and see if that solves the problem.

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