Hi.
You probably bought on the website the just nomal license and not in the App Store. What is fine so far, as with this you have full options for planning on the website and also all features for the Android app. But more or less not necessary for now. You might want to keep it or cancel subscription. When ios gets stable, you need to buy it anyway.
As the IOS version is still in beta, you must install the Apple testflight, and in testflight the ios app.