Hi,
What is the status of the iPad? Is it unlocked and checked in in the Systems Manager.
Unless you are using VPP and the iPad is supervised, the user will be prompted for confirmation before the app update will continue.
https://documentation.meraki.com/SM/Apps_and_Software/Silently_Installing_iOS_Apps
Thanks,
Please hit kudos if you found this post helpful and/or click "accept as solution" if this solved your problem.