You've touched on a major issue I have had since managed Apple IDs were implemented, the lack of the ability to push books to iPads based on serial numbers. We have not used Apple IDs for our students other than to designate who is using which iPad for Apple Classroom, though with Apple Schoolwork being released we likely will be rolling out Managed Apple IDs to every student. Unfortunately until Apple can give us the ability to push books to devices, something I've asked for for years, I don't know that there is an easy way to push books to Managed Apple IDs in Meraki.
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