As mentioned in App Cloner and on https://appcloner.app, Google account logins will not work in cloned apps.
The reason for this is that Google logins are facilitated by Google Play Services, which performs a certificate check of the cloned app against the API key used. When cloning an app the certificate changes as the APK must be signed using a new private key.
If the app or game offers another login method such as Facebook, Twitter, email or SMS login, please use the alternative login method instead.
Sometimes it happens that notifications do not work in cloned apps, especially when the cloned app is in the background. Some Android devices use aggressive memory management methods, freeing up as much RAM as possible by killing apps when in the background. Depending on the device, this may also affect persistent background services used for delivering new message notifications.
What you should try here is to exclude the clone from any battery optimizations in the Android system settings as this may keep the app’s background services alive.
Using the Launching option Request ignore battery optimizations you can create clones that will automatically prompt to be added to the ignore list.
You can also try to use the option Persistent app to keep the app alive even when in the background. You should remember that persisting apps may reduce the available RAM memory, especially when creating many clones, which might have a negative impact on other apps or system performance in general.
However, sometimes notifications simply don’t work in clones, as in the case with Skype. This may be because of the internal method used to deliver notifications from the server-side components to the app, which may break for modified app certificates or package names (which is often used as an app’s unique identifier).
As of App Cloner 1.5.27 the following options can be used on Android 10 but they are incompatible on all x86 systems like PC-based Android emulators (no matter which Android version). Also, they cannot be used on Android 4.x devices.