Ipad keyboard
Logitech keyboard on Ipad Pro 12.9 A1652 intermittently not working. Gets message "Accessory not supported". Cleaned smart connector, did updates, and restart, but the problem persists.
iPad Pro 12.9-inch Wi-Fi, Cellular
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See >>> If you see an ‘Accessory may not be supported’ alert - Apple Support
This alert is typical of a faulty keyboard. The electrical connections that pass though the flexible fabric hinges can fail or become intermittent - usually resulting in errors and/or the on-screen notification that you see.
In such circumstances, the only remedy is replacement of the keyboard. If possible, try to replicate the issue with another iPad - a visit to an Apple Store or other Apple retailer will likely provide access to demo/display units with which you might test your keyboard, or ask for assistance from the technicians at an Apple Genius Bar.