I have two Mac Laptops, one at home and one at work.
On one I am able to drag my iCloud side bar icon into the dock. I cannot do this on the other laptop. No special settings were required to do this on the one that enables this. Both iCloud settings seem to be the same on each computer.
According to the google chat bot, both computers should be able to “enable” this set up, yet without knowing some hidden detail I am missing, … I cannot have the iCloud folder in both docks
I have never tried dragging it from sidebar to Dock. I will try when I get home. I have always used this method How to Add iCloud Drive to the macOS Dock and not had any problems
Open iCloud from Side Bar > enable Show Path > Drag iCloud icon from the bottom of folder (the path bar icon) > drag the icon to the folder area of the Dock
That’s good. The method I use, as in the link I gave, puts the iCloud Drive application in the Dock, so it goes in the Applications part of the Dock. I put it next to Finder.