So I got AfW to work on an Samsung Nexus tablet with Android 5.1.1 on.
It pushes the App suite "Divide Productivity" to the device which enables you to use business email/contacts/calendar immediately.
https://play.google.com/store/apps/d....apps.work.pim
I first had not allowed BES to add or delete users from the Google domain. So I had to remove AfW from BES and add it again with the option to allow BES to add or remove users switched on.
After that, activating a device with AfW was easy.