Open Build Setting and check Development Build, Script Debugging, Wait For Managed Debugger. Build and Run with android device connected via USB with computer. Don’t forget activate USB Debugging
Wait until your app run in the device and showing this
Go to Visual Studio -> Debug -> Attach Unity Debugger
Select the ‘AndroidPlayer (USB)’ item and Visual Studio goes in debug mode. Note: This step can take a while if then Unity project is big.