We’ve been working around the clock on this and are getting really close. Here are 2 of the essential insights that seem to be stumbling blocks for most everyone who is trying to do this:
Here’s a great response from @NigelG on the topic that we’ve found to be really helpful.
Additionally, here’s another amazing post from @NigelG that explains how to set-up the main list correctly. This is also essential to get it working.
Let me know whether those insights enable you to get it working.