*Wish made. This is the first I've found any real info on the iBooks debacle. I can't believe it's been a full six months and System Manager still hasn't addressed this. Even if they don't have the auto accept invitation method built, just some instruction similar to this thread would be welcome. So, thanks @JCarey for this. Before I do a mass import I would like to clarify the actual field names you used. My "Owners" are all synced from Apple School Manager. They already have the managed appleid in the email field in system manager, but the "Username" field is blank. I'm guessing that this is where we need to duplicate the managed appleid - can you please verify? These are the instructions that display on the Import CSV screen: Update owners from CSV To more efficiently set device owners, you may upload a CSV file containing owner information. Email Full name Username Tags Optionally, the CSV file may also contain the columns Serial or WiFi MAC to identify devices. If a row contains both user information and device information, the device specified in the row will be assigned to the user. Rows with blank values for Email will be ignored. Any other columns are ignored. You may download a CSV file that is pre-filled with all devices and owners for this network Thanks for the groundwork!
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