Hi, Mubeblue!
Welcome to Microsoft Community and thank you for posting your query today.
We are glad to help you with your issue,
and after going through your messages,
we understand that you have troubles launching
Minecraft Launcher with a error code of 0x803F8001.
Here you can read and refer to the official explanation to check if it can be solved.
Error 0x803F8001 occurs when you launch an Xbox One game or app
If it still exists, we sincerely recommend you to try these methods in the support article.
Fix problems with apps from Microsoft Store
I hope this information would help you and solve the problem at once.
Please let me know if this does not work or if you've tried this already.
We are always here to offer you help.
Best Regards
Evelyn Qu| Microsoft Community Support Specialist