How to clone android apps?

Question

Android

Hi all!
There is an application, you need to create a working copy of 10 pcs.
The Xiaomi phone has a built-in option to clone applications, but no more than 2x. With the clone, everything is in order, it works stably. With push notifications.
Tried "App Cloner". Push notifications do not work in clones, they do not come.
How to make all 10 work with push notifications?
"App Cloner" - changes the name of the application package.
"Inline cloning" - retains the original package name of the application. And clones "Google play services" and "Google play services framework"
Help please, what can I do?