ADDITIONAL SYSTEM INFORMATION :
windows 10 on surface book (detached)
javafx 15.0.2
openJDK (Azul Zulu) 11.0.9

A DESCRIPTION OF THE PROBLEM :
Supplying the required properties to enable the native windows OSK fails to actually use the Windows OSK and instead uses the javafx Virtual Keyboard. When supplying the native value instead of javafx the system's OSK should be used.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
create a stage with a simple text field on it, launch it with the required arguments:
-Dcom.sun.javafx.touch=true
-Dcom.sun.javafx.virtualKeyboard=native
-Dcom.sun.javafx.isEmbedded=true

and touch the text field

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The windows native on screen keyboard appears.
ACTUAL -
the javafx virtual keyboard appears instead

CUSTOMER SUBMITTED WORKAROUND :
no workaround

FREQUENCY : always