Dial the Freedom keyboard with Huawei Smart P

I am trying to make my Freedom keyboard work with my Huawei Smart P.

Freedom keyboard

I turn on the keyboard. Then I turn on Bluetooth on the phone. Then I look for nearby devices. When the keyboard is on, the device's KEYBOARD is in the device list. When the keyboard is turned off, the device's keyboard disappears, so I assume that this is my keyboard.

I select KEYBOARD. Enter 0000 as the pairing key. The phone now shows the keyboard on paired devices.

I expected to have finished now. But when I use the keyboard, nothing happens on my phone. In some way do I need to tell the phone to also use the Bluetooth keyboard or is there some other step that is necessary?