iPad Pro Smart Keyboard "Accessory Not Supported" FIXED
The original thread is locked now, but when I read forums I really appreciate when people come back saying a fix worked- so just wanted to point out that mine was giving me this issue but thanks to @ipodge's reply I saw that above my #1 and #2 keys the plastic was separating inside of that gutter. It was the only place in the gutter with gunk, and after I scraped out/fully separated and removed the peeling plastic my keyboard worked perfectly again!
iPad Pro (2nd generation)