My first choice would be SharePoint SE (because SharePoint is commonly the back-end for Power Apps) but my questions are specific to Power Platform, not SharePoint. My second would be Stack Overflow as the default for programming questions. A search of the SE sites doesn't reveal anything specific to Azure, the Cloud, or Power Platform.
Update: I had to modify my question because it was closed as a duplicate. That was not correct. The question that my question is being compared to is about multi-platform apps.
Respectfully, there is a big difference between a multi-platform app, which is an app that runs on different platforms (like Windows/Mac or Apple/Android); and the Microsoft Power Platform, which is a suite of applications in Azure cloud. They both have "platform" in the title, but they are totally different things.
Secondly, since someone asked for the specific question, I am asking more in a general sense where I should pose ANY questions about the Power Platform. I might have a question about configuring Teams and Security roles in an Environment; or I might have a question about programming in a Power Apps application. I do not see a cloud-specific or Azure-specific or Microsoft-specific group within SE. I generally would ask in SharePoint SE if it was a Power Apps programming question, because that's the closest that I can think of. But my question was about configuration. So since I don't know every single community in SE intimately, I would rather someone point me in the right direction so I don't waste people's time in a community where no one is asking or answering these sort of questions.