Are you using ePO and have you installed the EMM extension?
We've got a query set up in ePO to show installed apps -
Create a new query>
Feature Group : Mobility Management
Result Types : Installed Applications
We're displaying our results in a pie chart with-
Pie slice values are: Number of installed applications (show total ticked)
Labels are: Application ID
Sort by: Value (descending)
Apply any relevant columns
We've not got any filters in place.
If you're not happy with any of the settings etc, amend them and run again. When you're happy, hit save.
We've then set up an EMM Dashboard with that and a few other queries showing and it seems to work quite well for us.
When you log into the EMM console, you know you can click on a device and then select the Applications tab to see what is installed?