Note: Store apps will ask for an Apple ID passcode before they will install on devices. Managed Distribution Device Assignment is preferred for silent iOS app deployments:
How do I install Store apps?
Navigate to the level where you would like to install apps. The Apps tab can be found in Home, School or Group level > Device Management > Apps.
Click the Install button to open the Install Apps page:
Select the Store tab.
Choose a device type from the drop-menu (iOS – iPhone or iPad) and enter the app name or keyword in the search field. A list of search results displays.
Select the checkbox next to the name of the app you need to deploy.
Click the Deploy… button.
The Deploy Store Apps modal will open:
Choose one of the following options, then click Deploy Now:
Devices will display an “App Installation” notice that the device user must accept before the installation can proceed.
Select a VPP Service from the drop menu.
Note: If you select Managed Distribution from the Deploy Store Apps modal, the app will be added as Managed Distribution to the group rather than a Store app. If there are no Managed Distribution licenses for the app against the selected VPP service, the app will not deploy and will instead act as a placeholder waiting for licenses to be purchased in Apple School Manager.