I too have had issues as to why you can't move apps to the SD card. I have found a way to do so: Tap on 'Settings' > 'About tablet' > Software Information'. Tap multiple times on 'Build number' until Developer mode is enabled. Exit out of the 'Settings' app and go back into it. If you scroll all the way to the buttom, you will see a 'Developer options' entry, tap on that. Finally, scroll to the bottom, and look for an entry that says 'Force allow apps on external' to enable it. Now you can go into the 'Apps' in Settings, select a downloaded app, and tap on storage, then tap on 'CHANGE' and select 'SD card' to move the app to the SD card. Hope this helps.
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