if one googles this issue., one will find now several users posting unable to get the keyboard to work. Several blame the 11.0 upgrade but there were problems in 2016 too. I have new Wi-Fi, new keyboard and have tried everytjing suggested and nothing works. With the old (7 month old) keyboard I started getting accessory not recognized. New one from Apple not recognized. Store rep said he had never heard of the problem until the day I came to the store and within 30 minutes of the store opening, three customers came in with the problem. Apple is absolutely no help. I do not think they have a clue