gamelift client NetworkReachability cunstructor missing in Unity build

I get the following exception during runtime on android:

MissingMethodException: Default constructor not found for type Amazon.Util.Internal.PlatformServices.NetworkReachability

The code below is executed:

var client = new AmazonGameLiftClient(
				"<accesskey>",
				"<secret>",
				new AmazonGameLiftConfig { UseAlternateUserAgentHeader = false, RegionEndpoint = RegionEndpoint.USEast1 }
				);

I didn't have any issues running the game client on windows and the server running on linux.