Hi,
We think it's frustrating that Apple renames the app identifier for Keynote, breaking compatibility with all apps triggering Keynote.
As a workaround, before we have the chance to update the app to use the new identifier, you can setup the Flic button on your phone/tablet with the Flic app there and configure it as a Keyboard with the arrow keys. Then connect the button to your Mac as a standard Bluetooth device (Bluetooth keyboard) instead of to the Flic mac app. This will allow you to control the Keynote.