When the Accountable2You VPN monitoring is enabled on your iOS device, Accountable2You is able to monitor the internet-connected applications that are used. This allows Accountable2You to create general estimates regarding how long particular apps were in use. However, due to continued Apple restrictions it is still not possible to see the specific activity that occurs within each individual app.
Therefore, when viewing your app usage report, if you click on a particular app, instead of seeing activity (as you would for any other type of device), you will see the activity field replaced with the phrase "Apple Restriction - Activity Can't Be Recorded".
Presently, Accountable2You can only monitor web browsing apps, YouTube, and Hulu.