You can check the installation status for all apps from your App Library.
To check app status:
From Device Manager, click Apps.
Under Installations, hover over the app you want to check the installation status for and Progress Overview will appear.
From here, you can see the number of headsets the app has been deployed to, and the status of those installations. You can click View Details to view the specific app status for each individual headset
Possible app installation statuses are as follows:
Installed: The app has successfully been installed.
Installing: The app is currently being installed.
Unknown: These headsets are not communicating with Device Manager, so the installation status is unknown. Please make sure that each device is plugged in, powered on and connected to Wi-Fi, then try again.
Failed: The app couldn't be installed on some devices due to file size, poor Wi-Fi signal or another error.