Why Is My Folio Keyboard Not Working. If your iPad doesnt detect your Smart Keyboard Folio or Smart Keyboard or you see an Accessory not supported alert on your iPad make sure theres no debris or plastic covering on the Smart Connector pins on the keyboard or the Smart Connector on the iPad. If the name does not appear for more than a minute you can try to disable and enable the Bluetooth.
Turn your Folio off and back on. Another method to try out is to check your connection. As it is obvious that a faulty or poor Wi-Fi connection would cause issues in the keyboards working.
Some users reported challenges working with their Smart keyboard and iPadOS.
If the letter D does not work here then it is a hardware issue with the keyboard. So when your iPads Smart Keyboard is not working anymore its frustrating. If that fails reboot the device and try again. Why is My Keyboard not Working on My iPad Pro.