Smart Keyboard not working on iPad Pro 10.5 inch
I tried disconnecting and rebooting.
iPad mini, iOS 9
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Remove the iPad from the Keyboard - and carefully/gently clean the smart connector contacts on both the iPad and keyboard with a soft pencil eraser (a drafting-film eraser is ideal). Ensure that the contacts on both iPad and keyboard are dirt and dust free - and all debris from the eraser have been removed - before reconnecting the two.
If you are unable to resolve the problem, you would be well advised to visit the Genius Bar at your local Apple Store or Apple Authorised Service Provider (AASP) - where the technicians will be able to test and assess your iPad and keyboard:
Genius Bar Reservation and Apple Support Options - Apple