Got access to the Xbox Game Pass for PC, but aren't able to use it as you can't download games? Well, I had the same issue (You can get this without the game pass, of course). This video shows you the solution that worked for me, as well as a lot of other solutions that you may find more luck with.
Xbox Game Pass App for PC: https://www.xbox.com/en-US/xbox-game-pass/pc-games
Timestamps:
0:00 - Explanation
0:40 - The error [ 0x80D03002 ]
1:11 - Registry fix (Download Mode)
3:23 - wsreset
3:47 - Windows Store Troubleshooter
4:11 - Restarting & Resetting Windows Store
4:47 - Claiming ownership of WindowsApps folder
6:24 - Installing Xbox App & Dependencies
7:34 - Restarting download
7:48 - Changing region (VPN & Windows)
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Everything in this video is my personal opinion and experience, and should not be considered professional advice. Always do your own research and make sure what you're doing is safe.