Xaml island app fails on Microsoft store

[jindal1979]

I am trying to submit an App built using XAML ISLAND based WPF .Net Core 3.1 App. However, the package is failing with:

WAP_3.20.1.0_x64_bundle.msixupload121.2 MB
Package acceptance validation error: You cannot submit pre-compiled .NET Native packages. Please upload the Microsoft Store appxupload file and try again

I have built the sample Xaml Island Apps from this github also, however they all fail with same error. Please help me.