Hello,
I have a Sharepoint List for which I recently created a PowerApps form using the "Powerapps -> Customize form" option in Sharepoint list. Our organization does not have a Premium subscription, but I was able to create the form anyway.
Shortly after the form was created, it would warn that it wasn't available due to requiring a PowerApps subscription. I clicked "Start a Free Trial" to get past it, but now I'm wondering why it's asking for a subscription when the form created without one without asking for a trial?
I'm not seeing Sharepoint listed as a "premium connection" (reference: https://powerapps.microsoft.com/en-us/pricing/#compare-plans )so what else could be giving this prompt?