FLEET_STATE_ERROR - No relevant information in logs

I am using the Unreal Engine Gamelift Server SDK Plugin.
After packaging a build, I can test it locally with the Gamelift-local jar and I can create a game session and join it just fine.
When I upload the build to gamelift however, the fleet validation process fails after successfully finding the runtime path.
None of the logs indicate an error, and I am left grasping at straws as to what the problem might be here.
Is there any way I can retrieve additional information as to what caused it to fail?
Any help is greatly appreciated.