@Ashwin Gupta, Thanks for posting in Q&A. To get the app installed on one mobile devices, the API it uses is Get mobileAppIntentAndState
URL :https://graph.microsoft.com/beta/users/{usersId}/mobileAppIntentAndStates/{mobileAppIntentAndStateId}
Alos, we can use Get mobileApp API to get the apps.
https://learn.microsoft.com/en-us/graph/api/intune-apps-mobileapp-get?view=graph-rest-1.0&tabs=http
For the deviceappmanagment api, you can use select to choose the app you want isntead.
Hope the above information can help.
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