I tried to do a Sign in with Apple integration on Android (wanted the app to have the same options across platforms). Testing on Android was next to impossible. To test I needed an Apple ID with 2FA. But SMS 2FA was not good enough, you need the hardware-based 2FA. To get that you need a recent macOS or iOS device. As an Android developer I have no reason to own either of those. Eventually I just had a friend who own…
I guess this is the part I don't understand. How did you plan to test across platforms if you don't have an iOS device with which to test?