Please follow the steps:
1. Go to Explore section
2. Select all the devices (if user uninstalls the app and installs again, then in Explore section it's displaying as another entry which obviously not displaying at the time of choosing devices while sending a Campaign)
3. Send Push notification by following the rest of the steps
4. Go to the 'Message" section to check the status
Observe: There it's displaying sent status for all the devices, whereas the inactive tokens are not being considered as failure. So the statistics appearing in this section is not proper. Here, some corrections is required to maintain the data integrity.