Add-AppxPackage -Register -DisableDevelopmentMode "C:\Program Files\WindowsApps\Microsoft.UI.Xaml.2.8_*\AppxManifest.xml"

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This process re-registers the AppX packages for the current user, fixing broken links between the app and the OS registry.

Providing more details can help in pinpointing a more accurate and specific solution.

Unlike generic access-denied or network errors, 0x87e10bc6 points to a in the Windows App Runtime / AppX deployment stack.

In some instances, Windows Updates disable the Store Install Service erroneously.

A third-party firewall, VPN, or proxy may be blocking the handshake with Microsoft.