The two HID compliant touchscreen devices were not working on my Thinkpad X1 Yoga - investigation showed that they were not connected to the hardware.
So, I uninstalled both devices - thinking that Windows would fix this at the next update. No dice.
How do I reinstall the HID compliant touchscreen devices?
How then do I enable them so they are connected to the hardware?
I didn't find the right solution from the Internet.
References:-https://forums.lenovo.com/t5/ThinkPad-X-Series-Laptops/HID-compliant-touch-screen-device-missing/td-p/3609755product advertising examples