Now I can't even download and install the Xbox app anymore?

You could try running msreset to reset the store.

you could also check your system files by opening an elevated command prompt typing and press enter:

sfc /scannow

If that finds anything, reboot and try again.

Failing that also in an elevated command prompt type and enter:

DISM /Online /Cleanup-Image /CheckHealth

If that finds issues use

DISM /Online /Cleanup-Image /RestoreHealth

then reboot and see if that helps

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