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When you open Minecraft Launcher software, the full error message is:
'Minecraft Launcher is currently not available in your account. Make sure you are signed in to the Store and try again. Here’s the error code, in case you need it: 0x803F8001'

 
 Error code 0x803F8001 when launch Minecraft Launcher
 
Please don't worry, this article will help you fix this on Windows 10.

How to do:

Step 1: Open Control Panel > Programs and features. Then Uninstall Minecraft Launcher app.
Step 2: Go to Microsoft Store, download and re-install this software.
 
 

 
Step 3: Re-open and check.

Conclusion:

This error is usually caused by you downloading the software directly from homepage of Minecraft Launcher, you should uninstall it and download it from the Microsoft Store.
If have any problems, please comment as below. Thank you.