That is because you have to follow the steps listed on that page in order to package for android
Please help when I package my project(android) Unreal engine takes me to (https://docs.unrealengine.com/en-US/Engine/Tutorial/Mobile/SettingUpAndroidTutorial.SettingUpAndroidTutorial/index.html) This page please please please please help
Disable the Rider for Unreal Engine plugin and install Visual Studio in the source code section of the editor settings.