Silent notification to track uninstall

I see many companies, many services detecting the app uninstall. But for us it does not work: we always receives 200 in respond from APNS. The app was uninstalled 5 days ago, but we are sending a silent push and receive 200 in respond from Apple.

The payload:

{"aps":{"content-available":1},"tr":"0:2049:1975810513:5211877005877838604:465"}

Everything's implemented as described here:

https://developer.apple.com/library/archive/documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/CommunicatingwithAPNs.html#//apple_ref/doc/uid/TP40008194-CH11-SW15

https://developer.apple.com/documentation/usernotifications/setting_up_a_remote_notification_server/pushing_updates_to_your_app_silently

Guys, please tell what's going wrong?

Regards,

Pavel