Third party switches cannot be configured on a Hue bridge. Only official Philips Hue switches and Friends of Hue switches can be configured on a Hue bridge. Other switches like this one can be paired with the lights and bridge but the switch will never be visible in the app. Just like for example the IKEA switches: How to connect IKEA TRÅDFRI smart controls to a Philips Hue bridge?
It looks like this switch is compatible with deCONZ: New device EcoDim 8 button wall remote · Issue #3009 · dresden-elektronik/deconz-rest-plugin · GitHub
At the moment it is not supported in Hue Essentials, so if you want to configure it you need to do it using button events. You can find the button events here: Button Events - deCONZ REST-API
This switch is on the wish list for future development and a better UI could be added in the future.