Sent: the total number of users estimated in the audience selection at time of send.
Delivered: the actual number of who received a push notification that was published in their Notifications tab.
Unsubscribed: the number of people that have opted out of push notifications since the last message was sent.
Failed: the number of people in the audience selection that the server encountered an error sending a push notification to.
Reasons a Push Notification Would "Fail"
- The user uninstalled the app from their phone. (most common)
- Issues with Apple or Google push notification servers. (uncommon)
- General connectivity issues affecting the broader web. (uncommon)