iPad Pro 6th Gen Magic Keyboard "This accessory is not supported by this device" Fix
One Day My iPad Pro (12.9-inch) (6th generation) Magic Keyboard just up and quit working. Giving the “This accessory is not supported by this device". iPad and Keyboard are both Basically new (2 months old). I tried moving my iPad to another keyboard I had. Didnt work. Note, the iPad would still charge fine using the keyboard’s usb-c port. Just coudn’t type or use the trackpad.
Fix
I used (WD-40 brand) Electrical Contact Cleaner, sprayed it on a paper towel, and then wiped it on the 3 contact points on the back of my iPad and the keyboard. Problem Solved. My Keyboard is working like normal.