I found another way to trigger an app fail to download showing the cloud icon with the down arrow.
Automated Enrollment / DEP using a PreStage. Enrolled over the air using a guest network. Setup as a new device (not restored from a backup)
Navigated to the Settings app and disconnected (forget this network) prior to switching to the production network.
The Self Service app was in the middle of the download/install.
Jamf inventory record shows all tasks complete, update inventory and send blank push would not reinstall the app.
Needed to delete the app on the glass, then update inventory and blank push.
I know I've seen posts about (while not this exact behavior but this outcome/state) and wanted to add my .02
however was not able to find any of such posts currently.