Hi FFposos,
I'm Rodrigo and I will help you.
There isn't any keyboard shortcut for this touch keyboard, the easiest way to activate it is to set the touch keyboard icon appear on the taskbar, to set it, right-click on the taskbar > Taskbar settings >On "Touch Keyboard" set it to "Always" so the icon will always appear on the taskbar, making it easy to activate.
On the Touch Keyboard, select the gear icon > Give feedback and add your suggestion for a key combination to activate the touch keyboard, it can be useful for other users too.