From personal experience wrapping Powerapps to iOS and to an IPA files, you are going to have more issues too, but I think the solution could be your permissions. To be frank, it could be a thousand things, but the first thing I would check is to verify the account you are signing in with actually has access. Additionally, check your data source. If it is stuck inside your organization or anything like that, you won't be able to access it on iphone. I know these are trivial checks, but I don't know if you have done them yet and they are the first things to do.
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