I received this message from App Review Team We discovered one or more bugs in your app. Specifically, the Sign In with Apple button was not functional. Review device details: Device type: iPhone and iPad OS version: iOS 15.2 But this is Apple's bug. I sent a message bellow to App Review Team. We have checked our app on iPhone X(real device) / iOS 15.2. Everything is working propery for us. If it doesn't work, can you give me a video? Sign In With Apple is not working with Simulator is Apple's bug. Not us. Please try our app on real device, not on simulator. All of users are using real device, aren't you? Thank you Then we were passed the review.