Inexplicable 0x80070020/0x80073CF6 when installing Msix

Brief description of your issue

When installing an MSIX directly AppInstaller inexplicably returns 0x80073cf6/0x80070020 insufficient memory, and fails the installation.

Steps to reproduce

Not sure, but what's been done:

• Install App by AppInstaller
• Test app
• Downgrade App for testing an integrated updater, by using a specific version Msix package
  • Whether the App was previously installed doesn't seem to make a difference,
    when uninstalling the newer, then installing the previous version, the error is the same.

We've seen this happen occasionally, without having identified the root cause - I couldn't reproduce it on my machine.

Expected behavior

Detailed error description, not just "Insufficient Memory" so in-house support teams can act upon this, instead of deferring and hoping this gets resolved some day.

Actual behavior

[Wed May 21 15:16:46 2025]{3864} ProgressReporter -> Main App Progress: 98
[Wed May 21 15:16:46 2025]{3864} DeploymentCompletionCallback
[Wed May 21 15:16:46 2025]{3864} DeploymentCompletionCallback -> Install Operation Failed. Error Code: 0x80073cf6, Extended Error Code: 0x80070020
[Wed May 21 15:16:46 2025]{3864} DeploymentCompletionCallback -> fallbackErrorText: Fehler 0x80070020: Das Paket kann aufgrund eines internen Fehlers oder wegen zu wenig verfügbarem Arbeitsspeicher nicht registriert werden. (0x80070020)

Logs:

Previous AppInstaller-attempt: AppInstaller-2025-05-21-15-16-38.676.log
Add-AppxPackage -Path -Force: package.log

Environment

Windows-Paket-Manager v1.10.390
Windows: Windows.Desktop v10.0.26100.4061
Systemarchitektur: X64
Paket: Microsoft.DesktopAppInstaller v1.25.390.0

Start by reviewing AppInstaller-2025-05-21-15-16-38.676.log and package.log, then compare the failed direct MSIX installation with the Add-AppxPackage attempt during the downgrade scenario. Done means identifying a reproducible cause or improving the reported error so support teams receive actionable details instead of only an insufficient-memory message.