Magic Keyboard this accessory is not supported by this device
restarted, updated cleaned contacts, reposition keyboard etc
iPad Pro (5th generation)
Question marked as
The alert that you report is typically characteristic of a faulty Magic/Smart folio keyboard. The electrical connections that pass through the flexible fabric hinges typically fracture - this usually resulting in errors and/or the on-screen notification that you see.
The Magic/Smart folio keyboard itself is not repairable. The only remedy is replacement of the keyboard.