SwiftUI2 Firebase Phone 認証the uiapplicationdelegate must handle remote notification for phone number authentication to work.

FirebaseのPhone認証で

the UIapplicationdelegate must handle remote notification for phone number authentication to work
が出たdelegateに
@main に

func application(_ application: UIApplication,
                 didReceiveRemoteNotification notification: [AnyHashable : Any],
                 fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
    if Auth.auth().canHandleNotification(notification) {
        completionHandler(.noData)
        return
    }
    // This notification is not auth related, developer should handle it.
    //handleNotification(notification)
}

を入れればOK