Before I proceed further some disclaimers here. If you are thinking from the title that I have been able to resolve the problem completely, unfortunately it’s not. My approach works for certain scenarios and not for all scenarios and I will explain where it works and where it doesn’t. And this is of the time I am writing this blog. Very soon Microsoft may release something much simpler.
Ever since I wrote the article on in-depth walkthrough of Power Apps custom control, I have been flooded with questions and one of them was – “How do I get the formContext inside my custom control code so that I can interact with other attributes on the form?”. And in the series of blogs, I have used Xrm.Page construct to access some attributes on the form and as we all know, it has been deprecated. Honestly when I used Xrm.Page I…
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Nishant Rana's Weblog 
I had a similar problem where I had to share data over cross domains hybrid pages (site/app online hosted by Microsoft and app component hosted on-premise). I used “postMessage” and some event handlers to request parent site (online) data and receive it in child component (on-premise). I think the approach in the blog is a good one.
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