Xamarin Android “App not installed”

While getting started on Xamarin Android, I had trouble installing the app on my LG v20 phone. I kept seeing the message “App not installed” and could not figure out why? I knew my phone’s debug settings were correct. I spent some time searching online and then came to the conclusion that I needed to sign the Android application package. This is not a well-discussed problem! If this post has helped you, please leave a comment below! Thanks!