Masking with Wacom tablet

[Maxi7]

Lightroom Version: 11.0.1

Win 10, latest version

I have a Wacom Intuos Bluetooth Tablet and for some reason i´m not able to use the sliders to adjust the setting for the brush. When i click on the slider nothing happens so i have to use instead my mouse.

[Rikk Flohr: Photography]

I tested with a Wacom PT-651 on Win 10 and am able to either drag or tap sliders in masking mode to adjust the value. 
Please make sure your Wacom driver is up to date. 

[Maxi7]

CTL-4100WL - Wacom Intuos S BT
Driver: 6.3.44-3