Eureka... it's looks like it is all about Wi-Fi dongle - Microsoft 2.4Hz Transceiver v9.0
I have this combo (sculpt ergo) for only 1 month when it started to working randomly and than stopped.
After batteries / drivering / plug-in and out, replacing usb ports, remove/install the Microsoft Keyboard Center app (feels like bloatware), looking at OS event viewer and other sites, cleaning Device Manager from exist and hidden --> nothing changed.
When it worked for a second I test the keyboard at: https://keyboard-test.space/ - no stacking key in any row as suggested on other post.
When I got a nasty message saying: Unknown USB device... code 43, and evet ID: 131, it takes me to the next level and moving from my work Lenovo laptop to my Lenovo home laptop. Firstly it was behaved the same, BUT after play with the flimsy Wi-Fi dongle and two more plug-in/out it started to work. Going back to my work laptop and made it - I hope it will stays like this, time will tell...
I trusted Microsoft hardware for years but that is my last round with them OR they will learn from Logitech how to create sturdy small dongles. As much as I like Microsoft ergo keyboards, this is simply unacceptable :/