Publish Single File (Release) fails for WPF .NET Core 3.1 application

Question

I\'m trying to publish a WPF Application (to a folder) targeting .NET Core 3.1, using Publish Single File, targeting win-x86. The application publishes fine for Debug, but fails

Answer 1

For me the error has to do with custom nuget sources, like Azure DevOps Artifacts. Sometimes the build script tries to restore nugets from Azure DevOps and fails with a (Unauthorized) error, which produces the error in the post.

Temporarily disabling the custom nuget sources, makes publish work again regardless of the options used like single file.