A Unity ID allows you to buy and/or subscribe to Unity products and services, shop in the Asset Store and participate in the Unity community.
Separate names with a comma.
Make sure to have your scripts in Assets/Scripts folder of unity project.
File>BuildSettings>Android>PlayerSettings>Inspector>OtherSettings>Configuration>ApiCompatibilityLevel: change .NET 4.x or whatever else you are...
I want to share my experience on same issue. Unity 2018.3.of2, installed with Visual Studio 2017 Community. Steps: 1) Used unity package manager...