Background App Refresh must be enabled on your iOS
device for anything to occur in the background (while the app is not on
the foreground / or if the device is locked).
To enable Background App Refresh, simply follow the steps below:
Step 1
In Settings, click on Connections
Step 2
In the Connections menu, tap Data Usage.
Step 3
Click on Mobile Data Usage
Step 4
Under the Application data usage page of ClickTime, enable the 2 options Allow Background data usage and Allow App While Data Saver ON