Problem
0x800B0100 is returned due to your app missing a signature in the subject, meaning your package is either unsigned or the signature is not valid.
Solution
You can easily correct this by reviewing the hash, and using the sign tool to sign the app.
SignTool.exe sign /fd SHA256 /a /f YourCert.pfx /p ThePFXPassword YourApp.appx
Notes
Known issues and troubleshooting tips for the MSIX Packaging Tool
Troubleshooting packaging, deployment, and query of Windows apps