Some platforms need an Maps API key to display the map within the application.
You are lucky, you don't need to do anything. Have fun!
Open the file DropItCode/src/DropIt.Mobile.Droid/Properties/AndroidManifest.xml. Insert your Google Maps API Key:
<meta-data android:name="com.google.android.geo.API_KEY" android:value="INSERT_MAPS_API_KEY_HERE" />
Open the file /DropItCode/src/DropIt.Mobile.Uwp/App.xaml.cs. Insert your Bing Maps API Key:
FormsMaps.Init("INSERT_MAPS_API_KEY_HERE");