Hi,
I was able to follow the instruction on this page to create a full page add-in to RE NXT:
So the full-page to be displayed is actually sourced from a PowerAutomate HTTP request received trigger flow. The method is GET.
When setting up the full page add-in:

I placed the URL of the HTTP request received trigger flow in the Add-in URL box.
I then added another add-in that is a home page action to this page add-in.
All is working well, the action show up under task, clicking on it opens up the full page served by the flow.
Now I want to add validation and is stuck. With a Tile, the request to the “back-end” flow is done through POST and with it is the uit parameter. However, when I change to method of POST on my flow and add the json schema, I get error in my console that the page was trying to do GET and failed.
Maybe I'm going about it totally wrong here, please let me know how I can get uit for a page add-in
Thank you,
Alex