Apple Smart Keyboard for iPad Pro 12” stopped working

For the last few of months, I’ve been having trouble with my Smart Keyboard connection to my iPad Pro. It started with a non-stop beeping, which seems to have resolved itself. Also, I would occasionally receive an ‘accessory not supported by this device’ notification, but then the keyboard would work after disconnecting and reconnecting it. Today, the keyboard stopped working and it’s less than 2 yrs old. After paying a premium for the Smart Keyboard folio, I would be sorely disappointed if needs to be replaced after 2 yrs.

Advice please - iOS is up to date, and I tried disconnecting and reconnecting the keyboard, restarting the iPad, wiping the surfaces where the iPad and keyboard connect.