Mobile App Users can use several types of Notification features to get timely info about data and feed items. For an overview of Notification features, please see Salesforce Mobile App Notification Types.
Check out the difference between Notification types used at Mobile, their expected behaviors, and tips to troubleshoot: In-App Notifications , Push Notifications , and Red Badge Numbers .
When there are concerns about Push Notifications, it helps to double check expected behavior on the documentation here: Salesforce Mobile App Notification Types and Disable Full Content Push Notifications.
On the phone home screen, the User may see a round, Red Badge on the App icon. This shows the number of noteworthy things that happened since the last time the User opened the App.
Push Notifications add 1 to the Red Badge Number. It happens at almost exactly the same time as the other Push Notification settings on that phone (such as a toast icon on the phone's lock screen).
Unlike Increases, a Decrease cannot happen until the App is opened. This is because:
When the User opens the Mobile App:
An API call is made to display the most updated Salesforce information. The User can tap the blue Bell icon to view their In-App Notifications. Now with the App open, the system can update the Red Badge Number. The system subtracts the number of viewed Notifications, and the Red Badge now only shows the number of Notifications that still were not viewed.
When the User leaves the Mobile App backgrounded:
The Mobile App cannot call out with the API. Even if they go to Desktop to click on the Bell icon, so they have actually viewed The most updated system information is not retrieved, so the system cannot subtract the number of viewed Notifications yet.
If a User is concerned that their Red Badge Number shows more than their actual unviewed Notifications, they only need to open the App & allow it to load up before backgrounding again.
If Users are concerned about the limitation on when the Red Badge Number can decrease, please see voting and comments on Chatter Notifications Consistency in IdeaExchange.
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