Thank you Daniel.
All set ups were fine but it still didn’t work. By the way a new driver is no more available for the FEK’s as far as I understand.
However, I figured out what the problem was. I have no idea how it happened but in the Settings of windows 11 when I checked the “KEF” System>Sound>Properties, I noticed both “Audio Enhancements” and “Spatial Sound” was turned on. When I switched them off, the KEF’s started to play through Roon and KEF’s were visible also. Thanks for your feedback, if I didn’t have to go through “driver update” process I wouldn’t see these options were switched on. To be honest with you, I have no explanation as to how they were switched on? I am suspecting maybe an application I recently loaded have done it but I need more detective work for this, I rather listen music!
You can close the case with this explanation.