apple keyboard bought with ipad is no longer recognized by ipad.

See the section in this link for Get Help, but if nothing helps, schedule an appointment at your Apple Store Genius Bar and show it to Apple: Use your Smart Keyboard Folio or Smart Keyboard with iPad Pro - Apple Support

If your iPad Pro doesn't detect your Smart Keyboard Folio or Smart Keyboard or you see an "Accessory not supported" alert on your iPad Pro, make sure there's no debris or plastic covering on the Smart Connector pins on the keyboard or the Smart Connector on the iPad Pro. Also, try these steps:

1. Make sure that your iPad Pro and Smart Keyboard Folio or Smart Keyboard are in the Type position and that you have the latest version of iOS.
2. Remove the Smart Keyboard Folio or Smart Keyboard from your iPad Pro.
3. Restart your iPad Pro.

If this doesn't help, schedule an appointment at your Apple Store Genius Bar as Apple has quietly extended the warranty up to three years for some keyboards with this issue.

Error message says device not supported

This use to be intermittent problem, but now I get multiple messages. This is annoying.

So this is Apple support? Not sure how this works and if Apple Care applies here.