Method for installing apps on corporate devices to be deployed to users
Try these:


I don't want to sound stupid, but have you selected the auto-update setting to be turned on for the app on the play store? You can turn on auto-update in the settings of google play store app and then navigate to the app and press the menu button and tick the auto update button.


Or


Delete Airwatch and ask the users to download the app again.
They can then recive auto-updates as the app is linked to their
account


Idea: From what I know you can deploy apps via Airwatch, so try deploying the Airwatch app update to the phones. (This is only an idea, It probably wont work, but is worth a try