Device token for push notifications not generated - ios

Question

Since a few days, I am unable to receive push notifications for one of my apps. I had a closer look and it seems it doesn't manage to generate a device token. I was able to reproduce it with a blank application and the following code (or the Swift equivalent):
#implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
[UNUserNotificationCenter currentNotificationCenter].delegate = self;
[[UNUserNotificationCenter currentNotificationCenter] requestAuthorizationWithOptions:(UNAuthorizationOptionAlert | UNAuthorizationOptionBadge | UNAuthorizationOptionSound) completionHandler:^(BOOL granted, NSError * _Nullable error) {
if (granted) {
NSLog(#"Granted.");
dispatch_async(dispatch_get_main_queue(), ^{
[[UIApplication sharedApplication] registerForRemoteNotifications];
});
} else {
NSLog(#"Not granted.");
}
}];
return YES;
}
- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken {
NSLog(#"Token: %#", deviceToken);
}
- (void)application:(UIApplication *)application didFailToRegisterForRemoteNotificationsWithError:(NSError *)error {
NSLog(#"Error: %#", error);
}
Push notifications were added to the app's capabilities (I've blanked out the team name and part of the certificate description):
and this generated the following entitlements file:
When the app launches, I get the usual popup:
and the app reaches the 'Granted' block:
2022-06-12 19:55:28.665018+0200 Sandbox[1704:108535] Granted.
but I see neither a device token nor an error in the log.