Going to bump this again. Really need some more information about the errors we are getting - there is no stacktrace or information in the Modeler, nor in the deploy screen at home.mendix.com. Just "oops, something went wrong".
It could be a java conflict, how will we now? Perhaps a connection timeout? No idea
We have followed the exact steps in the guide at https://world.mendix.com/display/howto50/1.+Introducing+AppCloud+Services+In+Your+App
Pretty sure we've done everything correctly. What hidden conditions are not being met?