Folio keypad
Why doesn’t my folio keyboard work on my ipad pro
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Do you see any errors or alerts when connecting your Apple Smart Folio Keyboard to your iPad?
See >>> If you see an ‘Accessory may not be supported’ alert - Apple Support
If you are using a Smart (folio) keyboard, the alert is typical of a faulty folio keyboard. The electrical connections that pass though the flexible fabric hinges typically fracture - this usually resulting in errors and/or the on-screen notification that you see.
The Smart folio keyboard itself is not repairable. The only remedy is replacement of the keyboard.