Cannot display Alphanumeric Keyboard using WebIQ in a WR21

Hello,

I am trying to use the Alphanumeric keyboard of WebIQ instead of the Android Keyboard of the WR21

In the preview of WebIQ and if use my laptop as a web client it works

However if I try it in the Kiosk of the WR21 it does not appear anything and, on the other side, if I use it in the Chromium app it still appears the Android keyboard,

I guess that it is a WR21 problem because in my laptop the HMI visualization it works so, how can I use the WebIQ Keyboard in a standard WR21?

Many thanks,