Windows touch keyboard stops working after Windows 10 Creators update (Windows 10 build 16000+).
The temporarily solution is bringing the old keyboard back by replacing files from previous Windows 10 builds.
C:\Windows.old\Program Files\Common Files\microsoft shared\ink
to -> C:\Program Files\Common Files\microsoft shared\ink
C:\Windows.old\Program Files (x86)\Common Files\Microsoft Shared\Ink
to -> C:\Program Files (x86)\Common Files\Microsoft Shared\Ink
If the .old directories are cleaned out (windows automatically delete the files a week after the feature upgrade), the older files can be obtained with the link below.
If keyboard folders are blocked in Windows the files can be replaced in command line or another file manager with bootable disks, for example. Another way is connecting USB keyboard and rebooting the machine. If touch keyboard will not start automatically, the directories will not be blocked.
This solution is only temporary since the touch keyboard files are replaced back with the new files with the monthly cumulative updates, perhaps setting permissions to the folders to be read only will keep the files from being replaced every month.