Hi
What error messgae are you getting when you try and renew? This would help me understand what is preventing you getting a new trial. You should be able to extend your trial.
As for why you are getting an trail at all I have a few questions to help troubleshoot....
What type of PowerApps license do you have? If you have a Plan 2 then you should be getting this message at all.
Can you tell me what type of connectors you are using in your app?
Usually this happens because the app has one of the premium connectors. We are working to make it easier to identify this after the connector has been added.
But if you can go to the View menu and click Datasources. And list them I can help identify of they are premium connetcors. Or you can click the "Add data Source" button in this list you wil see a gem icon for any premium connectors.
Hope this helps,
Rich