C9 Preview NOT working?

So I have a setup in c9 where two workspace environments need to talk to each other to develop my application.

Since moving to AWS, this hasn’t been possible at all. We get a preview URL just like C9 had, but this isn’t accessible between environments.

We’re given this gigantic convoluted way to make the workspace app public, but this is more like a giant ad for AWS services and is a massive pain to actually get working (I’ve tried, isn’t working).

Why is this not far simpler, as on the original C9 it was simply a checkbox to get this functionality.

Very disappointed, not a good start and I am not happy with how AWS is handling their new acquisition.