How do I get useful debug information from a dotnetcore application deployed to Azure Web Services?

Question

My appsettings.json is as follows:

{
  "Logging": {
    "LogLevel": {
      "Default": "Warning"
    }
  },
  "AllowedHosts": "*"
}

I then deploy through visual studio, targeting framework netcoreapp3.0 with deployment mode as Self-Contained.

My azure service reports the following issue:

HTTP Error 500.0 - ANCM In-Process Handler Load Failure
Troubleshooting steps:
Check the system event log for error messages
Enable logging the application process' stdout messages
Attach a debugger to the application process and inspect
For more information visit: https://go.microsoft.com/fwlink/?LinkID=2028526

The application logs contain the issue:

Application 'D:\home\site\wwwroot\' failed to start. Exception message:
Application arguments are empty.
Process Id: 4516.
File Version: 13.0.19218.0. Description: IIS ASP.NET Core Module V2. Commit: 4a42afc5aea63750638e118560d43db04bd9ccc2

However, I don't have application arguments since this is a web application. Could anyone please advise on how to get useful output from Azure Web Services that contain what actually went wrong?

The properties panel in Az Portal for your web app should include a debugging section. Turn debugging on then point VS at Azure and tell it to debug the web app. Might catch a startup error.. dunno. — Sam Axe, Nov 20 '19 at 18:46
"Application arguments are empty" usually indicates errors in your web.config file. Edit your question to include that please. — Lex Li, Nov 20 '19 at 21:03
My application does not have a web.config file, as it's an aspnetcore project. I have included my appsettings.json file. — freeone3000, Nov 20 '19 at 21:46