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Maybe these links could help...
https://medium.com/@madridserginho/how-to-handle-webpush-api-pushsubscriptionchange-event-in-modern-browsers-6e47840d756f
https://stackoverflow.com/questions/36602095/how-should-i-handle-the-pushsubscriptionchange-event
https://stackoverflow.com/questions/36602136/how-can-i-test-pushsubscriptionchange-event-handling-code
https://stackoverflow.com/questions/68504163/pwa-stop-receiving-push-notification-on-android-app-closed
Maybe these links could help...
https://medium.com/@madridserginho/how-to-handle-webpush-api-pushsubscriptionchange-event-in-modern-browsers-6e47840d756f
https://stackoverflow.com/questions/36602095/how-should-i-handle-the-pushsubscriptionchange-event
https://stackoverflow.com/questions/36602136/how-can-i-test-pushsubscriptionchange-event-handling-code
https://stackoverflow.com/questions/68504163/pwa-stop-receiving-push-notification-on-android-app-closed