This sounds a little like bug 1716232. But mostly the issue here seems
to be that your touchpad doesn't support scrolling(?).
Have you tried configuring the various scrolling methods available in:
Settings > Devices > Mouse & Touchpad > ...
?
** Changed in: gnome-shell-extension-ubuntu-dock (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1826196
Title:
The Dock cannot scroll without a mouse when multiple programs are open
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