I can confirm the bug on Windows 10, with Inkscape 0.92.3 and an old Wacom Graphire tablet.
In the input devices dialogue only "window" can be selected (this mode has other issues, e.g. no mouse pointer is displayed). If "screen" is selected the settings just jumps back to "disabled". But I can edit the file preferences.xml and set stylus and eraser to mode="screen" and both work as expected.
I can confirm the bug on Windows 10, with Inkscape 0.92.3 and an old Wacom Graphire tablet.
In the input devices dialogue only "window" can be selected (this mode has other issues, e.g. no mouse pointer is displayed). If "screen" is selected the settings just jumps back to "disabled". But I can edit the file preferences.xml and set stylus and eraser to mode="screen" and both work as expected.